It's been a while since I've uploaded anything, so I come bearing pronz! I think I did pretty well on this; I was going through the kink meme and since this prompt both caught my interest and was unfilled, I typed it out in one sitting. Concrit on whether Lavi was in character would be much appreciated.
"I've seen the way you look at him."
Lavi watched his former self warily. This whole thing was a complete mindfuck already, so there was no telling what could come next.
"As if it weren't bad enough that you're lusting over a man," Deak went on, "you know very well you can't have him. You can't have anyone."
Lavi fought to keep his mouth shut, not wanting to give him any satisfaction. Damnit, he knew that! He shifted in the chains, getting uncomfortable even after a few short minutes.
Deak was staring him down, the look on his face giving Lavi the heartwrenching feeling that he wasn't getting out of this safely. He couldn't help but wonder if he'd looked like that...cynical, dark, alone. Deak had been hateful, at war with the world and constantly despising the very functions of society. Lavi couldn't truly say if this was Deak he was facing now, or it was his accumulated lives joining together to show him his past failures. Was this vile creature his true self? He nearly shuddered at the thought.
"You've failed, Lavi. You're not doing your job."
"I'm doing my job just fine."
"No you're not!" Deak whirled around and stepped quickly toward him. Lavi tensed, and was right to do so; his dark self backhanded him harshly enough reverberate in the darkness, and chained as he was, Lavi couldn't do anything about it.
"When Lavi first arrived at the Order, his mind was right." Deak was kneeled in front of him, his voice harsh and angry, gripping Lavi's chin so that he couldn't look away. "He was neutral; he saw humans for what they truly are - they want nothing but destruction. Now he has friendships, he considers himself an Exorcist. He lusts after his comrade. His mind has been distorted by the immaturity of fickle humans. He's become weak."
"I'm not weak!" Lavi shouted, giving in despite himself. He shouldn't have let the words affect him. They shouldn't have affected him anyway, and that was the problem. If he were truly neutral, if everything Deak had said had truly been a lie, he wouldn't have felt affected by it, but he did.
"You are weak." Deak stood. "You can't even get rid of me, can you?"
Lavi looked up, only to have Deak smile at him, showing teeth in a feral imitation of a grin, while a foot pressed solidly between his legs, just enough to pass over pleasure into pain. Lavi gritted his teeth, but refused to give more than that.
"Is this what Lavi likes? Is that what he wants from that boy?"
Lavi shut his eyes, refusing to give Deak the satisfaction of an answer, only to have a hand harshly grip his hair and tilt his head up.
"Forget him, Lavi. Stay away from him. All you need is me...no one else."
Deak kneeled, forcefully covering Lavi's mouth with his own.
"If you want it so badly," Deak whispered, "pretend it's him."
Had Deak kissed him again, Lavi would have bitten, hard enough to draw blood - one last struggle before he gave up - but Deak forced him to turn around, facing the wall. Lavi's only choices were to give himself up and just take it, or pretend that it was him, because it was the closest he would ever get. Either choice left him stranded, alone, with a sick distortion of himself.