What, or should I say Who, does Issei do?

He has two hot women in his arms, why waste this opportunity?

Deciding to take things a step further, Issei lets go of Katase and takes off Murayama's shoulder cape before beginning to unbutton her shirt. Motoyama fidgeted as she tried to pay attention to the lesson. Pulling the shirt open to see her bra-clad breasts, Issei quickly does the same to Katase. Noticing the teacher frown at their state of undress, Issei quickly made another couple suggestions, "It is normal for the two of you, no all female Kuoh students to not where bras to school. It is normal for me to strip and have sex with girls whenever and wherever I want."

The teacher returned to acting like everything was normal while Issei watched the Kendo girls take off their bras and put them in their bags. Looking around, he saw his other female classmates unbuttoning their shirts just enough to remove their bras as well before buttoning their shirts back up.

Issei admired his handywork for a few moments, but before he could act, the bell rang.