Mystery: already solved. Kai had a feeling that Shinji had already had it figured it long before now. Those careful fingers had woven through his hair plenty of times already, Kai doubted he'd ever actually have to ask. Seemed like Shinji liked it just as much. Still, a little bit of concrete feedback seemed overdue.

"Mmm, you always know when."

Kai lifted his head just enough to catch Shinji's eye. "Another thing I love about your hands."