Chikusa has no idea what he’s done. One moment, things were as usual- they were both quiet and sated after sex, talking, making their way home. Normal things. The next moment, Ken is suddenly shoving into his personal space enough that Chikusa lets go of his sleeve in surprise as he stumbles a bit and he’s making strange noises against his skin. Good noises, he knows that much, but… strange.
This is almost more confusing than when he’d been bewildered by Ken’s outbursts of anger.

Hesitantly, confused as to how this happened and where it’s going, Chikusa runs one smooth palm up along Ken’s back while he nuzzles into him. There’s no missing his words when he’s so close like this. “...I…. do…?” His confusion isn’t because of uncertainty regarding his own feelings, but rather about this whole situation. He thought he’d made that clear, that he wants and needs Ken too. What is he missing?