Sam and Cass go to check Samantha's rooms, while Dean is to keep an eye on her. But once the other two leave them alone, she smiles at the hunter and proposes: “Well, Dean, as we wait for your brother and your friend to come back empty handed and apologize, can I offer you a drink?” Meanwhile the younger hunter and the angel find her spell book, hidden behind a closet in the kitchen. They also see her collection of herbs and dead animals and alarmed, Sam starts reading the page with the bookmark. As soon as he understands, he tells Castiel: “I think Dean's in danger. This is a love potion!” Cass turns on his heel and storms down the hall, back to the bedroom where Dean is guarding Samantha.
The witch has her back to the door, because during her playful chat with Dean, she had moved around the room, maneuvering him closer to her bed. Dean has his eyes closed and his head tilted back, while downing a beer in one gulp. When Cass throws open the door and barges in, he cries out in fear: “Dean!” The older Winchester opens his eyes and looks towards the door. Samantha meets his gaze, sure that she has won. And Dean does smile at her, a sweet, open, lovesick smile. Cass' face flushes at the sight, and even more when he hears Dean say: “Oh my God, I love you!” Then he starts to walk toward the witch. But instead of taking her into his arms, he looks right over her head, at Cass. And he shoves Samantha aside, taking the last few feet in a stride, to stand directly in front of his friend, ogling him from head to toe, just to then cup his face and plant a long, deep kiss on him.
Samantha cries out in rage, and Sam comes flying through the door, to aide the others in apprehending the witch, but he is baffled by the sight of his brother kissing the angel. Castiel, overwhelmed by his own feelings, is unsure how to react and thus only halfheartedly pushes Dean, without much success. Samantha, seeing that she lost and not keen on being held responsible for Dean's state by the other two men, throws some exploding powder at the floor, blinding the gang, and then shoves her namesake into the still kissing couple to escape. Cass tries to grab her, but when Sam stumbles against them, all three fall to the floor.
Once they hit the ground, Dean finally lets go of Castiel's lips, but only to hastily stand and pull his friend up with him, asking with a worried face: “Cass dear, are you alright, are you hurt?”, all the while ignoring Sam completely. “Yeah, I'm okay.”, the other answers confused, the look of shock still on his face. “What about you? Are you feeling… strange, Dean?”, he carefully asks. Dean takes both his hands into his, smiling a radiant smile and answers cheerfully: “Oh, I'm so happy, I still can't believe it... how could I be so blind all these years!” And he starts kissing Cass' hands. While never leaving his eyes, he exclaims: “You are so beautiful, so wonderful, so pure! I love you so much, babe, I never want to part with you ever again!” He almost starts crying from joy, tenderly plastering the angel's hands with kisses.
Cass and Sam on the other side look at each other horrified and Sam tries to talk to his brother: “Dean? Dean! That's not you! That Samantha gave you some potion, to turn you into her slave! What you're feeling isn't real!” Hearing this, Castiel has to swallow hard, but chimes in: “Yeah Dean, you're not yourself. Try breathing steady for a while, I'm sure it'll fade soon.” But Dean just looks at his mouth and whispers: “You have such a wonderful voice. I could listen to you for days! And your mouth... your lips, your tongue, your perfect teeth... I want you so much!” His grip tightens and he moves closer.
Sam tries to step in and places one hand on both mens shoulders to push them apart. Only to get sucker punched in the face by Dean. Sam is so surprised, that he trips and falls flat on his back. Dean turns to him for the first time, standing in front of Cass as if to protect him and shouts: “Keep your hands off him, he's mine!” Sam holds his jaw where his bro hit him and yells: “Hey idiot, I'm your brother, calm down!” But Dean just stares at him and insists: “So? Wouldn't be the first time you tried to steal my love, bitch. But you're not getting him, he belongs to me!” Cass, unable to handle the situation, looks at Sam and says: “You better find a way to fix him, fast! I need to go!” And with that, he disappears.
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However, as soon as the angel leaves, Dean gets really agitated. He looks around confused and starts to shout: “Castiel? Cassie? Babe? Where'd you go? Honey? Cass?”, pacing around the room, getting faster and even more wound up. Sam tries to stop him: “Woah, Dean, chill out! This isn't you...”, but Dean gets more aggravated by the second, pulling his hair, screaming and sweating, with fear on his face and tears in his eyes. 'Good God!', Sam thinks, 'He is like a puppy whose owner left for work.' But Dean seems like he is really in pain. And then, he suddenly grabs the empty beer bottle Samantha had left, smashes it against the table, and uses the resulting shards to slash at his left wrist. Sam tries to stop him, but Dean kicks at him, crying out: “Castiel! Baby, please come back! Cass!” The blood is squirting everywhere, but Dean seems more freaked out by Cass' absence, than by the deep cuts he is inflicting on himself.
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As he is just about to move to his neck, the angel returns and slaps the glass pieces out of his hand. Immediately, the hunter starts to calm down and resumes to stare at his person of interest. Cass gives him an angry look, but grabs his bleeding wrist and starts healing him. This lets Dean relax even more, and he gives a little content sigh, much to the embarrassment of his brother and his friend. Cass, once finished, wants to start yelling at Dean, demanding why he would do something so stupid, but his infatuated friend stares at him with loving eyes and hums: “Please don't leave me again angel! I need you, I can't be without you, I... I just love you so much, it hurts!” And with that, he pulls him into a big hug, holding him tight, crying at his shoulder for relief. Cass looks at Sam in deep confusion and starts gesturing behind Dean's back. Sam though starts reading the spell book again.
After some time, in which Dean starts cuddling Cass, stroking his back and bumping his head against the other man's like a kitten, Sam calls out: “Oh fuck! I understand what's going on now. This won't be easy.” “Why, what is it?”, Cass demands. “Well, this is a very strong spell, much stronger than I suspected, and intended to turn the victim into a lovesick slave for whomever he or she first sees after drinking the potion. That's what must have happened, he saw you before he looked at Samantha! And now he thinks he's madly in love with you! But the worst thing is, we can't just isolate him and wait for the effect to wear off, like some other spells would allow us. Whenever the object of his affection is too far away from him, or if he gets rejected, he is put under strong mental stress and physical pain! And it won't become better with time... in fact, separating you from him might... kill him!”
Sam had to pull himself together to utter these last words. Castiel becomes pale. This is all too much for him. So when Dean turns his head to whisper in his ear: “Oh, you are so cute, my little honey bunny!”, Cass jumps in fright, knocking his friend back. But this gets Dean to tense up again and he pleads: “I'm sorry honey, what did I do wrong? I won't do it again, I promise!”, and he reaches for Cass' hands. Cass looks at Sam in agony, but the young Winchester simply responds: “As I said, rejection hurts him. We should try to get him home and I'll search for a way to undo the spell. But you need to stay with him! Think you can handle it?”
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When the three step outside, Cass is the first to reach the Impala and sits in the left backseat. But both he and Sam are surprised when Dean doesn't take his place in the driver seat, and instead circles the car to sit in the back with Cass. He is still wearing a lovesick smile and stares at the angel longingly. By now everyone realizes that this love spell is a damn serious matter and that Dean is no longer himself. Sam examines the scene, but then shrugs and takes the wheel to get them back to their current base. It is a quiet ride, Dean isn't even missing his music, but he does reach for Cass' hand and squeezes it tight. Sam just looks at them, half amused and half worried for his brother, while the angel shifts in his seat and nervously pulls back his hand to tighten and loosen his tie.
Suddenly Dean leans over to Cass' ear and hushes: “Oh Cass, I want you so much! I could do you right now in the car! Would you like that?” Cass inhales sharply, but keeps his eyes straight ahead. He is hearing the heavy breathing from his friend, and seeing him bite his lower lip out of the corner of his eye. Then Dean pulls back to gaze at him again. His green gems seem to be glowing, radiating like the heat from his body. To break out of this magic moment, Cass casually interjects: “You don't really mean that.” “Oh, but I do!”, Dean insists, and places a hand on Castiel's knee, “I would do anything for you... or with you!” The last words are just above a whisper.
“What did he tell you?”, Sam asks, noticing the angel's shocked expression in the rear view mirror. “Nothing. Nothing important.”, Cass answers evasive. Dean starts stroking his leg, while looking at him seductively. Then he leans in closer again, but instead of hushing more forbidden thoughts at Cass, he simply sticks out his tongue and licks over his earlobe. Cass shrieks and elbows Dean out of reflex, throwing him to the other side of the car. Dean immediately starts to apologize: “I'm sorry love, I didn't know... I won't do it again, I'm so sorry, please don't be mad!” “What did he do?”, Sam inquires in a worried voice. “He licked my ear!”, Cass exclaims, still in shock. “I'm sorry, it won't happen again...”, Dean tries to appease him, but the angel cuts him off: “Just stop touching me! Okay? No more touching my body without my permission! You got that?” “Yes. I'm sorry.”, the hunter answers sad. 'Oh man, this will be harder than I thought!', Sam ponders to himself.
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