It was a very silly mouth thing to do, but it was also very cute. Kai definitely wanted to kiss it very much. He would have! Right now! Except that cute little smooch on Shinji's part just solidified what Kai was already starting to suspect.

"That's good," Kai murmured with a slow grin. "Cuz I'm pretty sure 'm not gonna stop."

So they were going to have to wait for that bit of making things up, or they were never getting out of this shower. Kai let Shinji go, glancing down at himself a bit. "I might be good though... How're you?" They had been going for Shinji's back before the uh. The happening. Let him catch a peek at your behind, Shinji.