She's enjoying it

Although she cannot see what's happening behind her she feels another hand slam down on her arse, sending a jolt of pain through her.

A little nudge with your powers and suddenly she doesn't feel ashamed, she's excited.

"Harder!" she moans, and you hear gasps of surprise coming from the students behind her.

It takes a few seconds, but one of them clearly gets the idea, and steps up once more, landing another slap on her bare arse, sending another wave of ecstasy through her body. "Oh... fuck..." she moans, her free hands playing a little over her breasts as yet another slap sends an explosion of pleasure through her body.