[His mouth shuts with an audible click of his teeth snapping together, another growl in the back of his throat. He does want it. He wants it even more badly than before now that he's had a taste of it. Ren's the only person who's seen the real him, who kept reaching out, and now Akechi has to slap that hand away harder than before.]

Justify it to yourself however you want, [he hears himself saying past the leaden weight that's settled in his chest. The scant scraps of his brain that aren't tied up screaming about what just happened are working overtime to figure out how to fix this.] You're incapable of doing anything like this without getting feelings involved, and I'm not interested.

[That's the only explanation he can come up with to try to explain why he'd let himself kiss Ren back. If he frames it in the purely physical, then it's fine. He can just keep lying. He's always been very good at lying, ever since he learned that people like a kind lie more than the honest truth. His back straightens as he forces himself to meet Ren's eyes again, forces himself not to look at his lips, or the nail marks he'd surely left on his shoulder.]

Don't forget that we have a deal, Ren. That's all.