[He keeps his explorations shallow and limited to one finger for the time being, tracing along his perimeter then dipping deeper and deeper in. It's shocking how tight and hot it is and Ikki's more than a little curious about how that would feel around his dick right about now.
Except you know. Then he'd be technically fucking his normally male best friend and are those boundaries ones that he really wants to cross?
And for the record sticking two fingers inside of Kazu doesn't count as crossing boundaries. Because he says so.]