[ Well if he does THAT that is going to make not squirming very difficult, though Naoto does make a valiant effort to stay still regardless up until Sion is just putting his fingers everywhere and then he can't not wiggle around a little, and when Sion says something he starts to look all flustered again ]

I— you— I. Don't... make me headbutt you again. I'd do it.

[ VERY COHERENT AND SEXY NAOTO GOOD JOB ]