Oh? Oh! Right. A clean time. Shinji was definitely letting himself get wrapped up enough in the promise of 'continuing' that the soap hitting his skin comes as a slight surprise.

Perhaps it's some mixture of that surprise and the way Kai's chosen to go about sudsing him up that shakes a small, single laugh out of him. Cute... he really is shockingly cute. "Here, lemme just..." lean on over super quick to retrieve some soap for himself, for his own antsy hands ready to get back into Kai's hair.