"UGhh! ooOO!" Elsa screamed and moaned as she was banged from behind by the head mistress.  Thank god no one was around to see this she thought!  In a way, the rhythmic thrusting of what she knew to be a woman was a turn off for the bigoted Elsa, who really wasn't ammused by the concept of being pounded by a woman. Still the anal butt plug was pounding away at her colon, and for the blonde slut, that was more than enough stimulation.  "EEEEECK  PLEASE!"