Laura tossed Tenur onto the bed. Her shoulders were getting sore but most of all, her legs were shaky from meeting with such an obsessed Sarah.

"Never knew there would be someone so into you," Laura dropped onto the floor while sucking in deep breaths.

"Me neither," Tenur replied while rubbing his back. His lower body was still immobile, but he thought it'd get better after some time. "But you've got to admit she's kind of attractive that way."

Laura looked at him with a blank look, which elicited a 'what?' from him. She shook her head before starting again. "We should get my father to look into your back."

"Thing is..."

After a few seconds of silence, Laura was sure something was wrong."Is what?"

"I... accidentally... left him," Tenur confessed softly.

"You...!" Laura stood, but soon bit back her words when she saw what was on Tenur's desk.

"Finally noticed my absence while the two of you flirted?" Denka started forcefully sucking mana out of Tenur's testes.

"Ah, no!" The victim got agitated, then his body started jolting uncontrollably. "Argh!"

Tenur held his crotch in his hands tightly as his balls got hotter. His testes were getting forcefully overloaded due to Denka's forceful mana suction that would've left him dead if not for his absurd ability to increase his mana regeneration several folds, just like how he'd previously do it except for the involuntary part. The side effect of the ability would be what he's currently experiencing: incredibly heated balls.

Laura looked at Tenur, every emotion emerging in the same moment. She was surprised, sure, but she was even happier that her father's revenge was actually making her feel good as well, yet angry at him for threatening their host's life just for some 'extra food'. With her mind a jumble of thoughts, her inaction was the best action in the current situation.

Stolen from Royal Road, this story should be reported if encountered on Amazon.

A few minutes later, with Tenur crying from both the pain in his crotch and legs, Denka left it at that. He was quite satisfied considering how much 'mana' or sperm he got from Tenur. Laura, on the other hand, awakened from her dream-like state and went over to see how Tenur was doing.

"Dad! Look what you've done!" Just getting her own hand near his crotch was enough to let her feel the heat and mana emitted.

"That was revenge for him leaving me behind, and also using me as a tool!" Denka grumbled. Tenur groaned as tears streaked his face.

"Fucking hell dad, I broke his back! Why do you think he didn't come over to throw you out the window!?" Laura pointed at the window. Her night vision allowed her to see in the night as bright as day.

"Wait, what?" With a cooling wave that swept the whole room, Tenur's cries were muffled and he could move his legs again with some dull aches here and there. "You'll have to patch those up with some good ol' medicine, but what!?"

"Ugh, you never listen properly to what I say even after you turned into a book!" Laura complained. "I broke his back before we came here to make him owe me a favour, so our mutual favours would cancel each other out."

"So... The abnormality jutting out of his lumbar wasn't actually a second dick— Ah, that explains everything," Denka was no longer frustrated, but held a kind of apologetic mood. "Sorry 'bout that Tenur..."

"It's... Okay..." Tenur managed to mutter out before he fainted from mana deficiency. After a quick release of a mix of volatile and stable fertility mana and magic, Denka was able to deem Tenur's condition to be 'not fatal'.

"Okay, so he's treated now... I sincerely hope what I assumed just now to never be true." Denka stated firmly.

"Agreed, but..." Laura had a brow raised. "Why did you think he'd get a second penis?"

"Uh— because— uh— so— mana projection for fun? Heh?" Denka gave up on coming up with something better. Her daughter sighed and ignored him.

"Gracious, I'm heading back to my bed dad," Laura reached for the door, but before she left, she left a precious word of advice for his father to heed. "Grimoires were never meant to kill their host, dad." The door to Tenur's room clicked shut after that.

"I know..." with the only person in the room asleep, he felt his words were as empty as his heart had once been. "But the balance of the world must not be interrupted." He quietly started a channel between Tenur's mana pool and his own ethereal storage.