His face twitches into some combination of a smirk and a grimace -- somehow, he'd been suspecting that to be one of Kaito's "rules." He yanks his one hand away, shaking it to try to relieve some of the stinging soreness. The other hand, though, he keeps where it is as he continues to kiss Kaito back, the fact that he isn't having his mouth fucking torn open yet being a pleasant surprise. He doesn't push anything with it, letting Kaito set the upper level of force for now, as his tongue occasionally brushes against the other man's, his entire approach almost playful.