Sans had kind of had it with Frisk in a few ways. He wasn’t… mad, exactly, but he was kind of feeling like… if they wanted to sacrifice themself for his pleasure, and just serve him with no consideration for their own needs, and pretend they didn’t care about what they wanted, then maybe he could just show them what that looked like.

He was trying to be considerate of them, damn it, but maybe for just a little bit, he could be done with that and just do whatever the hell he wanted.

“get ready to heal,” he said and grabbed the top of their pants.

He didn’t give them any time to prepare and just unleashed some magic, holding their gaze with a dark look all the while. They met his gaze, an expression of pleasure and worshipful need on their face as his magic ripped into them.

He didn’t want to wreck his room or seriously hurt them, but shards of bone tore through them and their jeans alike. He was pleased to note there was no blood - they’d managed to take his attack completely on their soul, despite his lack of caution. Their skin was reddened where he’d struck them and the sounds they made as their clothing was wrecked did not help with his sanity.

Apparently, cruel and wrong as that was, it was nowhere near too far for them. His own restraint cracked a little more, seeing that.

As soon as the attack stopped, they reached out to the save point and were flooded with vitality. The redness disappeared and their body was pristine.

And what a body it was. He raked a hand down to their freshly waxed pussy, exploring it roughly and making them gasp and squirm under his touch. He didn’t have any particular care towards human fuzziness levels, but he appreciated the effort.

He was being deliberately cruel anyway. He didn’t want them to have true satisfaction on any level, not yet - playful flicks of their clit, and spirals of sensation around their labia, but the first thing that would enter their pussy would be his dick.

He loved that idea, that they'd grow increasingly desperate to feel something within, increasingly focused on that lack, and their only relief being his direct pleasure.

But while that idea was incredibly appealing, there was also the fact that he was half insane with his own desire, and their pussy was ready and right there. They were soaked, and their pussy was practically glowing red, so flushed was it with desire.

He could imagine how it would feel.

He could just tear off his shorts and drive into them.

But then all this would end, and he just… he didn’t want this to be over. He might feel like he had to stop, afterwards. But if he got them to suck him off first, then he’d feel like he was still supposed to get back into the fray. His refractory period wasn’t long at all, as long as he was… motivated.

He flipped them over and squeezed their ass. Undyne had obviously made them do a lot of squats because damn, that ass. It was a thing of perfection. And, due to their preference for loose clothes, he was the only one who had any idea. He slapped it and chuckled at the way it jiggled and Frisk yiped. Then he decided to torment them a little more. He spread their cheeks with one hand and flicked their asshole sharply.

The mortified sound and way they writhed under him… he couldn’t wait to feel them writhing on him. He kept chuckling, amused at their struggles.

But first, he wanted them to suffer with need as much as possible while they sucked him off. And provide some extremely valuable information in the meantime. He flipped them back onto their back.

“time to show me,” he said. “show me how you like to be touched and don’t let yourself cum. i want you lost to desire. i want you to know that you’ll only cum when i feel like making you.”

“As you wish,” they said, clearly well into insanity already.

They pulled themself up into a kneeling position. One hand snaked down to their pussy, rubbing at their clit roughly. The other clawed into their neck, ripping down towards their breasts, leaving sharp red lines in its wake.

“you really like the pain, don’t you?” he asked.

“Y-yes,” they admitted, breathless as they shifted from rubbing their clit to stroking around their entrance. “I know you don’t want to hurt me, not as much as I want, so I’m trying not to… not to ask you to do things you don’t want to do.”

“i’m kinda frustrated with you right now,” he said, and they flinched. “maybe hurting you would be more fun than usual - as long as you’re getting off on it.”

They shuddered and ripped their hand away from their pussy, and he watched it clench on emptiness. That brought them close, did it?

His plans for the day involved memorizing every little hint of them approaching the edge. He'd gotten damned good at reading people, and was planning on pushing that skill as hard as he could. About as hard as he planned on pushing Frisk.

“I don’t want you frustrated with me,” they said in a soft voice.

“you say that,” he said. “but you’re supposed to obey me and you were trying to defy me, weren’t you?”

He stroked their hair gently, and then gripped it tight and pulled them against his chest. The way their body felt, squirming against him…

“I wasn’t, not really,” they protested, their breath hot against his neck.

Their hand was touching their pussy again, and with the way he held them against himself, the back of their hand was moving against his dick. It felt good. It wasn't what he really wanted, but it made it harder to resist temptations.

“You wanted me to not die, you wanted things that matched my tastes, you wanted me to hurt but only within the extent I could enjoy, you wanted my body to not be seriously hurt at all,” they said. “You just didn’t have enough faith in me. You didn’t trust me to give you what you wanted. I am skilled enough, Sans, to do this and have it all.”

Maybe they had a point.

“it’s hard to believe you could really enjoy that sort of pain,” he said.

“Test it,” they said, their eyes blazing. “Hurt me, Sans.”

He could. But…

“tell me, frisk,” he said with a grin. “you keep pulling your hand away from yourself. how close are you to cumming?”

“S-so close,” they murmured, pressing their body into his and damn that felt amazing. “I keep getting so close, too close, but I can suffer more for you, this is so good…”

He reached up and pinched their nipple again. They cried out and shuddered against him, pulling their hand from their pussy.

“you almost came from that, didn’t you?” he asked.

“Y-yes, almost… god, Sans…” they whimpered.

“i could make you cum just like this, couldn’t i?” he said. “squirming against me while i hurt you.”

They shuddered again, gripping at his shirtly tightly.

“Yes,” they whispered, half an answer and half a plea.

“but you don’t get to cum yet, do you?” he asked and they whimpered deliciously. “so i can’t try hurting you right now, because then you’d get off and i wouldn’t get to see you like this.”

Another thought occurred to him and he chuckled.

“i want you to know how hot i find this,” he told them, the madness in their eyes growing brighter at his words. “it’s driving me insane, watching you squirm, hearing those sounds you’re making, feeling you move against me like this. i don’t want this to end, so i’m dragging it out, even though i can’t handle much more myself. i’m pretty close to cracking, and as soon as i do, i’m going to start taking your mouth.”

The way they clung to him and moved, the desperate sounds of pleasure… holy crap, it wasn’t far from getting him off. Extra benefit of taking their mouth first - he wasn’t going to last long at this rate. He knew telling them that would push their buttons, but damn.

He took off his jacket and tossed it across the room. It made him feel really vulnerable - more than he’d expected. It was a strange contrast - he wasn't feeling afraid of Frisk exactly, not at all, but being around someone other than Papyrus without a jacket was twigging at him.

He didn't want to be uncomfortable so he left it at that, and they resumed squirming against his body. It was funny - they weren’t touching his dick with their hands, presumably because they were still unsure if they were allowed to for some reason, but they had no problem grinding their pussy and abs against it.

He could just pull down his shorts and then drive right in, they were right there.

He wanted to feel it.

Ah, fuck it, why not.

He lay down on his back and pulled them on top of him. They squirmed against his erection, moaning as they clawed at their breasts, refusing to touch their own pussy because of how close they were to cumming. He hadn't quite gotten to see them edge themself as much as he'd prefer, but even so, he was pretty confident in his ability to drive them to their limit.

After admiring the view for a moment, he pulled down the front of his shorts and pressed his dick up against their pussy.

The wet heat scorched him and he almost lost control. The heat of them, the way the folds halfway wrapped around his dick, the way their body was trembling, the look on their face…

He grabbed their hips and almost drove himself inside. No, he wanted more than just this. If it was only gonna be the once, he wanted to get everything he could, but damn it, he couldn’t take this…

Yeah, he was done delaying.

He couldn’t quite reach their hair from here, but that was hardly an obstacle. With a surge of power, his magic gripped their body and threw them into the wall beside him, pulling them off his dick. The cool air almost felt painful, as intense as his desire was. They gasped and stared at him in wild-eyed need, falling to their hands and knees beside him.

Now their hair was in reach.

He gripped it, entirely uncaring of whether it was the right amount of strength, and pulled their head into position. He held them there and just started thrusting into their mouth.

The sensation of their tongue, the slick heat of their mouth around his dick, were almost too much. His body was magic - he could resist cumming as long as he wanted to, but it was really hard to stop himself from wanting to. He barely held back, driving to the back of their throat with each thrust.

Sadly, as turned on as he was, his dick was a bit big. If he could pull himself back more, make it a little smaller, he’d feel them around the whole thing, but he was way too far gone for that sort of restraint. His dick was as mutable as the rest of his magic flesh, but that required focus, which was just not available. He’d just have to make do with their mouth around most of his dick, and enjoy the sounds they made as he slammed into their throat.

He also retained enough presence of mind that he was paying attention to whether they tried to pull away - he didn’t want them to actually choke or gag. But so far as he could tell, they were thoroughly enjoying this.

He tried to straddle the line between enjoying this and losing himself, since as much as he wanted to blast down their throat, he didn’t want this to end.

But then something changed.

One of his thrusts didn’t stop at the back of their throat. His dick phased through, immersed in a sea of vitality that surged into his body. Surged into him through his locus of pleasure and desire, twisted as it passed through him, and filling him with desperate pleasure and need.

They’d done the thing that he was afraid of, but in so doing, he lost control. He didn’t care if they were hurt. He didn’t care if it was too much. He didn’t care if this was wrong and screwed up. He didn’t care about almost anything.

There was only the wetness and heat and pressure and desperate motions of their tongue. There was only their whimpers, moans, and gasps, the amazing view of their ass sticking out into the air as they bent over in service to him. There was only that illicit surge of pleasure each time he passed through their flesh, consuming them with each thrust, and transforming their life directly into magic, strength, and lust.

It didn’t take long before his pleasure peaked. But he didn’t cum in their mouth, where it was safe, where their soul and flesh would protect them from the surge of power. He came inside them, fully inside them, where their soul was defenseless and torn apart by the wild magic.

Stars burned in his bones, the pleasure of his orgasm carried by the wave of vitality to infuse his entire body and he fell limp under its intensity.

They pulled away hard as he came, and he realized he’d almost killed them, but the aftershocks of his pleasure were keeping his mind addled. They immediately reached out to the save point and drew on its power, the grey cast of their skin immediately restoring to vigor.

There was no way he’d admit that was the best orgasm of his life. It would encourage them and that was dangerous, damn it. He’d been right to worry.

After saving, they smiled at him and then snuggled into his side.

“Sorry,” they whispered from beside him. “For pulling away like that.”

“you did the right thing,” he said, still soaking in bliss. “i don’t want you hurt.”

“H-hurt?” they asked, sounding confused. “No, Sans, that’s not what happened.”

“it isn’t?” he asked, looking over at them.

Even with his pleasure spent, the look of desperation and need on their face was still hot. Yeah, it wouldn’t take him long to get back into things.

“No, not even close,” they said. “Okay, maybe that’s not true. It was probably closer than you’d like. Er. If I’d taken everything, definitely closer. But I could have taken it all.

“No, the problem was I lost control. I started to cum, and I’m not allowed, I had to pull away, else I’d be bad, and I realized after that you might have preferred for me to cum then. I should have realized ahead of time and asked what you’d prefer.”

Aaaand his dick was already starting to reform.

He wrapped his arm around them, holding them close to his chest. It was odd and pleasant - halfway like an affectionate cuddle, and halfway erotic, as they were still trembling and squirming pleasantly.

Either way, it was nice. He had no complaints.

“you were good,” he said, and they let out a happy sound that pleased him on too many levels. “you did just as you should have.”

He just… really liked this, and in the afterglow of the most powerful orgasm ever, he just couldn’t bring himself to care about abstract thoughts about what was or wasn’t the right thing to do. He wanted to be here, Frisk wanted to be here, and it was good.

“you know, i’m actually a little capable of thinking again,” he said.

“Mmm, that’s kind of a shame,” they murmured as they gently rubbed at his chest. “It was so hot, what you said, that I was making you lose control.”

He almost admitted that he did, in the end, but didn’t want to encourage this. He still thought it was dangerous. And now that his mind was starting to fully clear, as the afterglow began to fade… what the hell had he done? He knew his magic was dangerous and practically poisonous to life.

And despite knowing that, he just let himself release a surge of that deadly magic without even warning Frisk that his orgasm might be more intense than they might have expected, as far as the danger went. He didn’t even try to restrain it, to make sure the magic was harmless, he just let it flow, knowing how dangerous it was. It was a flagrant risk to their life.

But a part of him just couldn’t bring itself to care, because he knew it would just be a tiny reset, like the many, many thousands they’d already done, and it’s not like Frisk would object to sucking him off again.

He had to admit, his prediction of what would happen if Frisk accidentally died from that was probably to find it hilarious, not upsetting. A quiet part of his mind even predicted that they’d find it hot, but no, he couldn’t think that, it was way too insane. Even for them.

That quiet part of his mind was looking at him skeptically.

But Frisk’s opinion aside, what had just happened was… he let out a sigh.

That distant sense of wrongness peaked its head out again - he couldn’t just let himself kill them during sex, that was way too messed up!

He let the feeling wash over him and fade away. That’s not what today was about. He was just going to run with it and think about things in an abstract way later. Whatever happened today… it’s not like it’d have any true consequences, save for knowledge, save for changing his opinions.

Because in this moment, he couldn’t help but accept that Frisk was utterly and absolutely his, and damn it, he liked that. He pulled them a little closer, feeling their warmth and just appreciating it, even as they trembled.

He liked that he could just take comfort or pleasure from them any time. He liked knowing that all the times he’d been lonely, he could have just called them over and had warm hugs and a listening ear, or mind blowing sexual pleasure, or both, and they’d have been so happy to be that for him.

Sure, he’d been lonely in a number of ways, but… it was his own fault. He didn’t have to be. In this moment, the idea of going back to that, of refusing to call on them for anything too personal… he didn’t want to. His hand stroked down their back and backside, gently but possessively.

This felt so good and he never wanted to let them go.

Their trembling slowly eased as they lay in his embrace and their desire seemed to settle into contentment.

“this is nice,” he said and they hummed in agreement. “sorry for, uh, being kind of cruel to you.”

They giggled and poked him affectionately.

“I can’t cum now, but I’m going to be cumming to that memory so much later,” they admitted breathlessly. “It’s going to be so hard, holding myself back from whatever you’re going to do next.”

“you do seem to have cooled down quite a bit, though,” he said.

“I’m no longer on the edge, but that means I can take more without pulling back,” they murmured, wriggling against him delightfully. “Maybe you could test it, now, how much pain I can take before it becomes unpleasant, now that I’m not on the edge of cumming?”

“you want that, don’t you?” he asked. “you want me to hurt you.”

“It feels soooo good,” they confessed with a moan. “I didn’t want to admit it before, it’s still so embarrassing, I shouldn’t be like this, but it’s so good…”

“it’s kinda funny,” he said with a little laugh, pinching their ass and making them yip. “i was trying so hard to figure out what your tastes were. what you liked, what you wanted, because i didn’t want to just take advantage of you, i didn’t want to hurt you. but you’re a slutty little masochist who wants to be hurt and taken advantage of. it’s not just your devotion, it’s your fetish.”

They were glowing such a bright red it was a wonder they weren’t casting shadows. They squeaked and buried their face into his side.

“tell me if i’m right,” he said and they trembled again.

“Y-yes,” they said.

“you get off on the idea of being used,” he continued. “whether i’m using you directly, or what you’d said before, giving you to someone else for their use.”

They made another mortified sound and buried their face into his side with so much pressure it was almost painful. He poked them.

“God, yes, Sans,” they whimpered, a sound of embarrassment so pure it was beautiful.

“and does it always turn you on when i give you orders? even for non sexual things?” he asked, continuing to stroke his hand along their very pleasantly soft skin.

“No, but, it always feels really good,” they said, relaxing a little as they rested their head on his chest. “It feels so… satisfying. Like being given a hug and being told that everything is going to be okay. But, um, if I’m already horny when you give an order, then yeah, it turns me on more. Even if it’s not sexual.”

“so you’re saying, if you’re turned on and i order you to… i dunno, swap out a lightbulb, it’d actually turn you on more?” he asked.

“The lightbulb part, no,” they said. “But the sound of your voice when you order me to do it, the pleasure of knowing I’m of use to you, the pleasure of knowing you want me for something… yes, it would.”

“because, on pretty much every level, you just want to be mine,” he said, repeating words he’d heard and even said so many times, and only now was maybe finally understanding. They trembled again, nodding. “for my joy, my happiness, my use, my pleasure - sexually and otherwise. you really, actually desire that. and not just out of a place of brokenness and a desperate need to feel like your life has meaning, but also out of… more than that. even as an outright fetish.”

The sound they made now, the look on their face - it wasn’t a simple thing of lust, desire, pleasure, and joy. It looked like it ran deeper than that. He brushed his other hand over their face, softly, appreciatively, then looked down at their taut, trembling body.

He wanted to do something about that… and with Frisk, if he wanted it, why shouldn’t he have it? Maybe he’d burn for it later, but he wasn’t going to think about that yet.

“i want to explore your body,” he said, tracing a finger down. “i want to see what you enjoy. you’re going to tell me what you’re enjoying, even if it’s embarrassing, even if you’re afraid you’ll drive me away.”

“Please, Sans,” they whimpered. “You… you have to want it, you have to only do things you want, if I’m left wondering, then I won’t… then it won’t be that good for me, but if I know it’s what you want…”

He grabbed their breast and roughly ran a thumb over their nipple, making them squeak.

“i’m not a sadist,” he said, and they gave him an amused look. “well, not exactly. but i love reactions, frisk. you know that. i don’t want to hurt you, but i do want the sounds you make when i hurt you.”

He pinched their nipple and they let out one of those delicious squeals of pleasure and pain.

“i don’t want you to actually suffer, but the sight of your desperation when i’m tormenting you and not letting you cum, leaving you insane with need… i like that,” he said. “i guess it’s a difficult balance, between being a sadist and not.”

“I think you kind of are,” they said, squirming. “You don’t want it to be so much that I’m driven away, that I’m actually having a bad experience, but you want me overwhelmed to the point of breaking.”

Yeah, his lust was definitely starting to fully wake up.

“you got me,” he said, trailing a finger down to their still-enflamed pussy. “so i guess what i’m saying is, i want to know what will give me the hottest reactions. what tools will drive you to the edge of insanity, what i could do that will break your will and leave you actually begging me to make you cum. for my sake, because that’s what i want to do.”

A shudder tore through them with desperate strength and they gripped his shirt and stared at him. Yep, that was exactly what he wanted. Damn, those eyes. Who knew that sheer insanity blended with lust so nicely on a face?

“H-hurt me,” they said, their voice halfway begging. “Take what you want of me, force me to do things, do things without warning, without asking, so I don’t know what’s going to happen. T-that’s what turns me on more than anything else, Sans, it’s so… so goddamn hot…”

“that much, i’ve figured out,” he said. “let’s find out more.”

He leaned over on top of them and just took in the sight of them. Would he ever be able to see them in a non-sexual way again? Would he ever forget the way they were looking at him now, naked and trembling, with that body that had been built and toned to perfection?

Maybe there were inescapable, permanent consequences to this after all.

Maybe it was already too late, and he’d find himself doing this again, and again, and…

Okay, he needed to stop thinking about that.

He knew they liked their breasts played with, and he manifested his tongue again, darting it over and around a nipple. They shrieked in surprised pleasure. He shifted the texture of his tongue, aiming for something rough - like rough studs, though he couldn’t quite get the texture even. Their body convulsed even harder as their skin reddened under the assault.

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“Fucking hell, that’s hot,” they whimpered. “B-be careful, I can probably cum from that if you keep it up.”

And he was completely hard again, without a trace of sexual satisfaction to be found. His tongue trembled on their skin, revealing his true reactions more than he normally would.

They suddenly grinned at him and his tongue went from pressing into their nipple to phasing into their breast. The surge of vitality hit him as they giggled and he reeled back in surprise.

Going through his tongue instead of his dick was way different and much less sexual, but it still felt good. He noticed, this time, that it actually seemed to… feed him, he supposed was a way to put it. He hadn’t used too much magic today, but he’d definitely used a decent chunk, and this had restored some real strength. It didn’t just feel good, it was an infusion of actual power.

That, uh, was dangerous in a different way. Frisk could draw power from cracks in time, and could apparently feed it to him directly. The only reason he slept and ate so much was because of the staggering energy requirements of his screwed up core, and this could directly sustain him. He didn’t actually need food or almost any sleep - he just needed magic.

He was absolutely not going to mention this detail until he’d thought about it in depth.

“That was so good, Sans,” Frisk moaned, writhing under him.

“this is supposed to be about exploring you, frisk, not you doing things that we already know you like,” Sans chided and they flushed. “maybe i should try pushing your masochism a little. not sure it counts as punishment, all things considered, but we can pretend.”

He’d intended to test out their masochism a bit anyway, and this was a perfectly good pretext.

He shoved them over to the save point with a laugh. They grinned sheepishly and saved.

“What are you going to do to me?” they asked nervously, biting their lip as they gazed at him with clear hunger.

That would never get old.

“in the spirit of punishment,” he said, grinning darkly. “i am going to hurt you. i want to know exactly how it feels.”

Sadism may not be his thing, but the look on their face when he said that absolutely was. Their breath caught, their eyes widened, their abdomen clenched, and their whole body quivered. It was really messed up that they reacted like that to saying he’d hurt them, of all things, but… well, it’s not like he didn’t know that they were messed up in the head.

He summoned a bone - a full sized one, of the sort he’d actually try to attack with. It was sharp, but he made it more ethereal, aimed at attacking the soul more than the body, kinda like how Papyrus’s were. With them having saved a minute ago, it couldn’t realistically kill them in a single strike, but it was a lethal type of attack, especially with the corrosive effect of his magic.

Their eyes were like dinner plates, and a flush had taken them in all sorts of places.

“You’re… you’re really going to…” they asked, breathless, looking stunned.

“shouldn’t we find out what your limits are?” he asked playfully, balancing the bone on his finger.

This had to be close to their limits, and that was in the spirit of punishment, wasn’t it?

They flushed a deep red and looked like they couldn’t speak. Rather than getting them to answer, he gestured at them to come closer.

Their suffering should be their own fault, by their own actions, after all. There was a delicious sort of irony to that that appealed to him.

Once they knelt before him, he scraped the sharp edge of the bone over their chest and abdomen, making them squirm. Their reaction was insane… but also so good. He couldn’t help but love this, seeing them go mad with lust, even if the reason for it was just inexplicable.

It was mad that they honestly looked like they were ramping back up, close to orgasm, from just this treatment.

But he had a decision to make. Where should he stab them? He didn’t want to have any actual negative associations, it might actually be a little much, they could be wrong about the level of pain they wanted… maybe the shoulder. He gripped them by the throat with one hand, making them whimper and squirm deliciously, and then drove the bone into their shoulder.

They cried out sharply and shook in his grasp.

“No, Sans, stop!” they yelled and it was like they’d thrown water in his face.

The bone vanished immediately, and he let go of their throat.

“that was…? i’m so sorry, frisk, i thought-” he started to say, but then something really unexpected happened.

They clapped a hand over his mouth and stopped him from speaking, pressing their body against him and writhed desperately. They weren’t asking, they weren’t offering, they were just stopping him. They didn’t do that.

“You have to learn to trust me, Sans,” they said, the heat in their voice scorching. “That wasn’t too much pain… I almost came, I was starting to, and I’m not supposed to yet.”

The look in their eyes was as insane as what had just happened.

“I want you to make me cum, I need you to make me cum, but I want it to be on purpose, I want you to decide to do that to me, not by accident,” they said and fucking hell, the sound of their voice, the look on their face, it was…

It wouldn’t be long before he dragged the two of them into the final act of this little play.

“And you wanted to know how it felt,” they said, their gaze drilling into him and making him feel like it was them in control of this insanity, not him, nevermind they they obeyed his every order. He just nodded dumbly.

They were grinding against him, squirming against him, breathing like he was actively pleasuring them, as they spoke.

“I felt you… you, Sans, your magic, your power, your intensity, your might, inside of my very being, helplessly run through by your strength. Pain isn’t important the way it used to be, it’s just intense, and if it’s on my body, it can be unpleasant, but in my soul, it’s now to the point that I just… it just doesn’t matter. It isn’t bad, it’s only overwhelming. And it was overwhelmingly you. Within me, burning me, flooding me with your soul’s magic, consuming me. The pain heightened it, blended with it, tore through my mind.”

So that did not sound sane, but he could kind of see why it seemed hot to them. He didn't want that, not for himself, but if it felt like that to them… doing it to them again seemed… it was tempting in a way he really shouldn't be tempted.

“tell me,” he said. “how close was that to your real limits? of how much pain would be pleasurable to you.”

The heat in their gaze seared him.

“I still think you don’t want to know,” they said.

“tell me anyway,” he said.

“I have no idea where my real limits are,” they said. “Not when it comes to magic damaging my soul, anyway - my limits with physical pain are, maybe not sane, but closer to it. Let’s just say that that little strike wasn’t anywhere close, and frankly, I don’t believe it’s possible for you to willingly approach them.”

They had no idea what their real limits were, outside of physical pain. No idea, despite having extensive, hours long memories of being murdered by him. The comments they'd made during that experiment took on a new meaning, in this light. He could kill them outright, and it wouldn't be too much. It wouldn't even be close enough for them to have an idea where their limits might be.

It should be upsetting, to know how deranged they were. But… instead, it was reassuring. He hadn’t wanted to truly hurt them, but they’d been right. He couldn’t. He just had a different way of pleasuring them. He supposed he could if he attacked their body, but neither of them wanted that. And it’s not like accidental magic interactions affected the body anyway.

Messed up as this was… it meant they were safe. Other than accidentally killing them, which would just be a small reset, with how often they were saving. That fear that he couldn’t quite put a finger on before - that he’d truly hurt them and they’d hide it or something, that they’d be willing to suffer for his sake but it’d secretly be a bad time… it faded away.

And in its place came a… it didn't feel like an idea, it felt too certain for that. He knew what he wanted to do, how he wanted to bring all this to its end. He wasn't ready for things to be over, but at the same time… the path felt laid out before him.

And they had said they liked to have things done without warning, but they also clearly liked having a plan laid out for them, so they knew exactly what was expected. It’d be a balance between surprising them and keeping them feeling secure, but he felt like he understood how to walk it.

“i’m glad you told me,” he said, gently stroking at their face again. “i’m going to tell you now how i want you to cum. you’re going to stay like this, needy and insane, for a little while longer. i am going to resume exploring your body and you’re going to continue to stop me every time i am getting close to making you finish, showing me how to drive you even further into lust and madness.

“you’re going to resist giving in. i don’t want you to do the devotion thing, of clinging to your insane determination to get through this, because i do trust that you could resist anything that way, but that’s no fun. i want it to be more… natural than that. i want you to resist as much as you feel like you can, with your own natural limits. i want to see if i can break you and force you to beg, and as soon as you do, i’m going to take you and make you cum on my dick.”

He grinned at the trembling, agonized, aching horror and lust on their face.

“of course,” he added in a casual tone. “it’s possible that i’ll crack first and i’ll just take you. i wonder if i’ll warn you first. maybe we’ll just have to play that by ear.”

The real benefit of getting to know someone’s buttons was how much damn fun it was to play them like a fiddle. Their eyes were wide, their breaths were sharp, their body was quivering, and they looked like there wasn’t a shred of sanity to be found.

“oh, one last thing,” he said, pulling them close and speaking into their ear. “it’s selfish, but i’m hoping you lose this little game.”

He didn’t want them to resist too much, after all.

“I-I just have to remember to save right before,” they said, trembling.

He laughed lightly in their ear, enjoying the feeling of their body against his.

“i love that about you, frisk,” he said, and heard their breath catch in a different way. “i’d completely forgotten about the entire reason we’re here. i just want you.”

The way they moaned at that… it wasn’t just lust and desire, it was more, and it warmed his heart to hear it.

He’d normally try to push that away, but they’d reminded him of the purpose of all this. It wasn’t supposed to just be a fun romp of sexual exploration. He was supposed to let them in. Let himself feel… feel like this. Feel connected to them.

He held them tight to his chest, and enjoyed the feeling of their warmth. But… it was through his clothes, because actually being naked was really uncomfortable for him.

But that was exactly the kind of discomfort he was supposed to be trying to overcome. The feeling of always needing a barrier between him and everyone else.

He could do this. He could let himself be more vulnerable.

And if he was going to do that, he should speak, too.

“hey, frisk,” he said, pulling back a little and they gave him a curious look, clearly hearing something in his tone. “i, uh… what you said, it reminded me of a thing. who’d’ve guessed, i got distracted again.”

“I couldn’t imagine why,” they said, smiling, then prompted him. “A thing?”

“uh, i should probably… i mean… i should maybe say stuff, tell you things, like, uh,” he said. Jeez, this was hard. “the reason i’m still wearing stuff is because, uh, i feel kinda… uh… i dunno. exposed or something if i don’t.”

“Vulnerable?” they asked with a soft smile.

“uh, yeah, probably,” he said.

They chuckled and touched the side of his face gently.

“I don’t want you to be uncomfortable, Sans,” they said, low and sweet.

They were being really nice about this, which wasn’t exactly surprising, but still. This was harder than he’d expected.

“kinda need to be vulnerable with you, though, right?” he asked, looking away and trying to seem less awkward. “that’s kinda the point. or a point. i dunno.”

They leaned in and kissed his cheekbone lovingly and tenderly.

“It’s your core you’re most uncomfortable with, right?” they asked, and he nodded. “Maybe just taking off your shorts?”

“you just want easy access to my dick,” he accused and they laughed.

“This is true,” they admitted with a grin. “But also, I want you to feel good.”

He didn’t even know what he wanted.

He did know that staying clothed and just moving aside his shorts would be easy. He knew that he was uncomfortable with his frailty, with how he was a single tiny accident from death at all times. It was a major reason why he wanted to remember the resets so badly - a form of immortality, after so many years of being a stray breeze from death?

He knew he kept people at arm’s length. He pretended to have no idea, but he knew damned well why things had stalled with Toriel. He just couldn’t be real with her. And she wasn’t an idiot, she could see that he always kept things silly and superficial, and while they really enjoyed each other’s company… there was absolutely no way he could ever see himself trusting Toriel with all this. With everything. She was gentle, and if she ever knew him, knew his secrets, why wouldn't she hate him the same way she did Asgore?

So he’d pushed her away, like he pushed everyone away. Laughter, fun, and superficial play, that was Sans. Always there for a good time, but anytime shit gets real, it’s deflect, joke, or maybe accidentally let something slip and pretend he was joking. Even with Papyrus.

But, with Frisk… maybe…

Even in his own head, it was hard to think of crossing that line. Of actually connecting, of actually opening up, of actually letting someone in. But a part of him honestly thought that it would, for real, be okay. That little faith, that real optimism, it felt… he wouldn't have been able to find words, but one thing he knew, it felt as warm and soft as Frisk's smile.

“i haven’t, uh, been with anyone since the incident,” he said, looking away. “didn’t expect to feel this awkward.”

Not exactly pouring his thoughts out, but he was trying.

They leaned down and kissed at his neck. This was feeling good in a completely different way that he did not feel as ready for.

“What would feel best for you?” they asked, continuing to kiss down his neck, to his collarbone.

“uh,” he said, sounding incredibly articulate and intelligent.

They giggled into his collar.

“You’re really cute when you’re awkward and not being all dommy,” they said.

He felt a flush.

“i have no idea what you’re talking about,” he said with a huff.

“And you blush blue, oh my god,” they said, flashing him a grin and giggling again.

“i have options. i can do things to you,” he said gruffly.

They bit their lip and their eyes sparkled.

“This is true,” they murmured. “Anything you want, Sans, always. No matter if it seems unfair. Really. Wear your clothes if it’s more comfortable, or doff them if you’d rather. I am yours, either way.”

He sighed and pulled them to his chest again. He had to be real, that was the point, it was the only way he could come out of this without feeling regret. It was hard, but he had to.

And there was something about this - the desire, the intimacy, the closeness, the vulnerability of everything they'd done and shared… it made it easier. It made this feel possible.

“i… i know,” he said quietly, with a feeling like something softly ripping in his chest. Scars, maybe. “this is hard for me, but the fact is, frisk, i trust you more than anyone else.”

“That’s not true,” they said with a happy laugh. “There’s Papyrus!”

“no, frisk,” he said, resting his head against theirs. He just breathed into their hair. “i haven’t told him things. i can’t. i haven’t told you everything, either, i guess. but… i mean, i still don’t wanna talk about a lot of that, especially right now, but… the idea of it, it’s less scary with you than him.”

The sound of their surprised inhalation, the tremble in their body, the way they hugged him tighter - it wasn’t anything like the lust of before. A moment later, he heard a faint sniffle. They were silent for a minute.

The idea of Papyrus learning his secrets, knowing everything he'd done was… terrifying wasn't even the right word. It was more absolute than that, deeper and more gut wrenching. Papyrus was so gentle, he might turn away. Probably not, especially with what Frisk had said about how he'd acted during their genocide timeline, but it still seemed possible. Some stuff was scary for other reasons - he didn't want to see Papyrus’s reaction to knowing how vulnerable Sans was, didn't want to see his fear. Or his lack of comprehension of what certain facts would imply - the idea of spelling it all out, walking Papyrus through it all… Papyrus didn’t even understand what death was, he believed everyone was still alive, and telling him that he’d intentionally misled him about that…

Frisk, though? The terrifying part was the idea of making himself say it. He just couldn't pull up even a smidgen of fear that they'd turn away. That they'd freak out. That they wouldn't understand. They already knew things Papyrus didn't, and hadn't given Sans any trouble whatsoever over his vulnerability. Partly, he was sure, because they knew better than anyone how skilled he was at evading harm. Even so, he also knew they trusted him and had no interest in controlling him.

He knew, all the way to his bones, that in some of the most important ways, they trusted him absolutely. And the feeling was mutual. They might not know that… but they deserved to.

“Oh Sans, I…” they whispered and trailed off. “I’m feeling so many things, I have no idea what to say, or…”

He laughed lightly.

“you don’t have to say anything,” he said, stroking his hand through their hair. “i already know.”

Another happy sound emerged from them.

“i want you,” he confessed, almost feeling like he was bleeding through the part that had ripped a moment ago. He felt them tremble as he held them close. “sexually, as a friend, as a companion, as a rock in my life, as a confidant… and as something that i can trust will be mine, that will obey me, that i can just have absolute faith in. i don’t know what feels more wrong - you being like this, or me wanting it. but if i’m ignoring that problem and just being real… the fact is, i do want it.”

He felt wetness on his shoulder, dripping into his core, as they squeezed him tightly. He sighed, running his hand down their back.

“heh, sorry,” he said, feeling bad about making them cry. “i guess my timing is kinda awkward.”

They laughed, and something in the sound felt so good, so alive.

“Don’t be ridiculous,” they said, their voice loving. “This is… the nicest thing you could have possibly done. It’s even better than the sex.”

“you sure about that?” he asked, shifting the way he held them a little in order to press his dick against their clit. They let out a broken gasp.

“Both are nice,” they breathed.

They turned their head and kissed his cheek again. A little more heat was in it, this time.

“Thank you, Sans,” they murmured.

“yeah, yeah,” he said awkwardly again. “maybe let’s just do the thing where i make you scream instead of all this sappy crap.”

They started laughing, softly at first and then with increasing gusto, until they fell from his embrace and just collapsed onto the bed. He watched them, a dumb grin on his face, just appreciating the sight of it, the sound of their joy.

“Oh my god, Sans, you drive me insane,” they said after a minute.

“that isn’t saying much,” he noted with a grin.

“True,” they said, smiling back with so much joy in their eyes it almost hurt to see.

How could this feel so right? He couldn't even feel any of the wrongness that had tormented his thoughts this last week. This moment just seemed… good. Perfect. Right.

They sat up again, moving to sit pressed against him. They ran a hand down his chest and then, biting their lip, let their hand rest on his dick, which throbbed at the attention.

First time they'd touched him there directly. Maybe they were feeling safer, too. Part of him remembered that he thought it was wrong, that they shouldn't feel closer to him, that this was all messed up… but in this moment, he didn't feel it. He was glad that they felt it was safe to touch him.

“So, for your clothes,” they asked, gazing up at him. “Do you want me to take them off?”

Couldn’t be more awkward than what he’d just said, right?

“uh… sure,” he said lamely.

They didn’t just tear his clothes off, like he suspected they were tempted to. They ran their hands down his chest and stomach slowly and gently before starting to lift his shirt. They lowered themself and kissed and licked at him as they rose higher, the sensation strange on the semi-real “flesh” of his core, but thoroughly enjoyable.

He lifted his arms and they pulled off his shirt, which happened to line things up so that he had a faceful of boob.

There was no reason to resist that temptation, and his tongue snaked out again, earning a trembling moan for his efforts. Their hands shook, but they gave him a piercing look as they drew their hands to his shorts with equal care and slowness as before. It seemed so awkward to him as they slid the shorts off, but Frisk seemed captivated.

“hey, look. its a BONE-r,” he said with a grin and they giggled and groaned.

After giving him a fond grin, they went back to staring at his dick. It started off invisible, but the more intense its… purpose, the more magic it had. The more magic it had, the more it glowed. Basically, it was barely visible by the time it was fully erect, and only grew more glowy from there, though he could suppress the effect if he felt like it.

He wasn’t half mad with lust, like earlier - it wasn’t shining like a blue star or anything - but its shape was clearly visible. Their mouth opened and their lip quivered, clearly wanting to suck him off again. Damn, if that wasn’t hot. His dick throbbed and the glow strengthened at the thought.

They swallowed and leaned forward to kiss it gently as they finished removing his shorts. Their lips were soft, with a hint of tongue that made his dick twitch again, and their breath was hot. He was absolutely tempted to take their mouth again, but no. He wanted something different for his pleasure this time.

Weird, how much more awkward he felt, being naked with them. And yet… well, it was Frisk. Sure, it was awkward, but he found he felt completely safe in every single way that mattered.

“we got distracted by something different this time, but you know the plan,” he said with a grin once his clothes were tossed away.

They blushed and grinned back at him, squirming eagerly.

“also, uh, it occurs to me - you aren’t cold, are you? i do have blankets,” he said.

They gave him a knowing smirk.

“Sure, blankets are nice,” they said, reaching over and pulling the blankets from where they were piled at the foot of the bed.

He’d changed the sheets, but actually making the bed would have just been asking too much. And they were easy access, which was the important thing.

He laid down on the bed and gestured to himself.

“c’mere,” he said.

With a blanket on their shoulders, they moved over him, straddling right over his dick. The look in their eyes as they hesitated there, with their dripping pussy just a scant inch from his exposed dick…

But no, there was one last thing he wanted to do first.

“on my face,” he said and they flushed before moving up.

It was kinda ridiculous, but he felt a lot better once the blanket was covering his body again. He hadn't had a reason to be naked with anyone, so he hadn't realized how bad his nerves were about it.

He discreetly confirmed they were both positioned in the way that lined up with his plan - Frisk was in the middle of the bed, with easy access to the save point - and then looked up at them.

It was a nice view, with their bare pussy right over his face, their tight abs curving up above that, and then their soft tits just beyond. He could see their face, too, but there was some great scenery along the way. Seeing their face was critical for this plan - he was planning on pushing them hard and would be relying on his ability to read their expressions minutely.

“you need to stay here and stay in position,” he said. “you can writhe some, of course, but you can’t escape me. you have to submit to whatever i’m doing to you, unless i’m about to make you cum, in which case you must stop me. and, of course, you must keep me informed about the effectiveness of everything i try.”

They squeaked out an affirmation and swallowed, holding themself steady.

“and don’t forget,” he added, “none of that is a real order that you have to obey - it’s what i want you to do. as soon as you can’t handle giving me what i want, as soon as you’re starting to crack, and you beg for your own sake…”

He extended his tongue and danced around their pussy, almost but not quite sliding in. They clenched and trembled.

He laughed at the desperate gasp that came from them and got to work.

Their clit was so swollen. The poor thing clearly needed some help, some relief, and not to be cruelly tormented anymore.

Too bad.

Turned out they liked some pain here, too, but loved the contrast most. A gentle, soft, thick, pulsating tongue pressing against the clit, suddenly shifting to a rough texture, tearing away, very nearly made him lose the goal of them not cumming quite yet. Their thick thighs, tight with muscle, were trembling constantly as they held in position, whimpering again and again as he whipped and tormented their pussy.

Keeping them at the edge was so much fun.

He honestly didn’t need their verbal feedback - they were really quite expressive - but it was fun seeing how embarrassed they were admitting things to him. And it turned out that, as long as he was having fun, they seemed to enjoy most things. Some things more than others, naturally, and he was happy to see that they enjoyed being tormented possibly as much as he enjoyed doing it to them.

The taste was also fantastic. It was definitely a different experience, tasting a human rather than his own kind, but the important tastes were all there, if a bit muted. While it wasn’t something he could really consume - not in a way that made sense for sex - even just the taste of their lust and pleasure was delightful. Their clit was especially so - it was so thick with pleasure and need at this point it was almost like licking a battery, the jolt was so intense on his tongue. And their vitality was richer and headier than any monster’s, which was also a treat.

At one point, he decided to harrow them in a different way. He reached up and ran his finger along their asshole, but they just shrieked and moaned, not saying anything. So he pulled back his tongue to ask.

“tell me how that feels,” he commanded, resuming his tongue’s torment.

“I’ve… I’ve never… ah…” they moaned, struggling with speech for some strange reason, as his tongue whipped at their clit again, and the tip of his finger went into their ass. “Oh my god, Sans, I can’t…”

They whimpered and writhed, but couldn’t move away from him and he chuckled.

He wondered if he should try to make them too distracted to speak, and then punish them for not answering.

“It’s good,” they moaned, “fuck, Sans, it’s good, I’ve never… it’s so wrong, but it’s still good, I don’t want you to make me cum like that, it’s so wrong, but fuck, no, please, that wasn’t an invitation to, ah…”

His finger was buried in their ass as he laughed at the red look on their face. He’d sheathed it in pseudoflesh, of course, and made it more slick, so its passage was easier. This was so much fun.

And it was more than just fun, too. Feeling them like this, tight and hot around his finger, feeling the muscles clenching with desire… it was hot as hell. He enjoyed the thought of taking them this way, but not for the first time, so… that meant probably never. It shouldn't ever happen. It really shouldn't. That's what he'd been thinking when he'd been clear headed.

Part of him was refusing to accept that, but most of him was refusing to think about it.

“do you want me to stop?” he asked, knowing damned well that they didn’t. And that they didn’t want to admit it.

“No,” they whimpered. “Please… Sans… I can’t… I can’t take much more of this… god…”

He extended his tongue again and danced it around the entrance to their pussy. He’d never let it go inside, but he decided to slip in just a little, just slightly teasing around the shallowest of their walls.

A half strangled scream came from their throat and they shook over him.

“Yes, god, Sans, please… I… god… I need…” they said, an adorable pleading whine to their tone.

Eh, it totally didn’t count as begging to the point he had to end this. Totally needed to be more coherent. The fact that he was having way too much fun had nothing to do with that decision.

They whimpered as his tongue disappeared, though his finger continued to wriggle cruelly.

“you need something?” he asked, amusement thick in his tone. “maybe this?”

He poured some more magic in and made his tongue much thicker and longer. He snaked it up the front of their body, extending past their belly button and reaching to their breasts, licking at the nipple. That was a bit more expensive magically, sure, but damn, it was worth it.

“Oh my god, yes, Sans, please, I need… I need you inside of me… I need to cum…” they whimpered, their hands clenching their thighs so tightly that their knuckles were white.

He laughed and let his tongue disappear.

His next trick would take some concentration, which wasn’t easy, but his malicious glee at the thought of their reaction helped him keep his focus.

He made his tongue thick and firm, then brought the tip to their entrance again and began sliding it in, slowly, caressing the sides as he went, spreading Frisk wide open.

But… every part of his tongue that got more than maybe half an inch in, he allowed to stop existing. They felt him sliding into them, but had none of the relief of him doing so.

Another desperate scream came from them, followed by a choked sound that was almost like a sob. Their body quivered and they fell forward, their knees bending and pulling their pussy away from his mouth a little, their arms on either side of his head.

“Please… god, please, Sans, I can’t… I can’t take anymore… I need… I can’t take it, I need you inside of me, please, no more, I need you…” they stammered out, and the look on their face…

An incredibly smug feeling filled him at that. The shame, the uncertainty, the desperation… they’d cracked. They’d tried to resist and reached their limit - without being ridiculously stubborn about it, and he did realize that they could have - but they had fallen to their need. They weren’t trying to please him, in this delicious moment. For their own sake, for their own need - that is what they were acting on.

They’d fallen a little, but there was still room for his plan to work. He teleported just a tiny bit upwards, so that their pussy was lined up over his dick instead. He grabbed at their waist and pressed himself against their entrance.

Their wide eyed shock was another in the long list of treasures he’d acquired today.

“oh?” he asked. “you want this?”

“Yes, please, Sans, please fuck me, please…” they whimpered and he pushed a little harder, starting to slide in just the tiniest bit.

He held still, grinning at them, curious if they’d remember. The feeling of their pussy on his dick was driving him to absolute distraction, but he’d had reason to remain a little more sane than they had, recently. They whimpered and gazed at him with a look that scorched his bones.

“aren’t you forgetting something?” he asked with the biggest shit-eating grin.

They stared and their eyes widened with realization, glancing over at the save point and then back at him. As though they couldn’t fully comprehend that they were actually about to get what they wanted, that the torment was actually over.

He laughed.

“i’m going to fuck you as soon as you’ve saved,” he said, and their body nearly convulsed as they desperately reached over to the save point.

If it weren’t for his own need, it’d have been tempting to teleport them both away, just to hear how loudly they’d scream. But no. He’d had enough, too.

Just as the golden glow began to fade, he gripped their hips and drove himself deep into their quivering wet heat and groaned in pleasure.