Ken huffs, although it's hard to tell if he's amused or irritated or somewhere in between. But a few moments later he pulls his fingers out of Chikusa, roughly smearing the last of the lube over himself.

He doesn't ask if Chikusa is ready, doesn't give him a warning; he doesn't need to, and he knows it. He shifts so that he's fully behind Chikusa, instead of slightly off to one side to give his hand room to work, and his now-free hand grips Chikusa's hip as he rocks himself against Chikusa's ass. It's hard to tell if it's deliberate or an accident that he doesn't push into Chikusa initially, sliding slick against his ass instead, but after a moment of re-positioning he is thrusting into him, shallow at first and then, on the very next thrust, as deep as possible.

Almost simultaneously, his teeth seek out and dig into the back of Chikusa's neck, his breath coming in hot and shallow pants against Chikusa's skin.