You, Mina and Kirishima were shopping. You and Mina were pushing each other's butts for fun. As you were standing at the checkout, you thought you'd push Mina with your ass again. So you pushed your butt back, but you felt it wasn't Mina...

You quickly turned around and saw Kirishima. Kirishima turned red, and as it turns out, you pushed your ass right into his crotch... He looked away fully red from embarrassment