Mona Wales, the dominant nun, presides over Audrey Noir, her sinful sister, in a brutal yet erotic session of BDSM. Mona wields a thick strapon, teasing Audrey's ass and mouth, making her gag and drool. Audrey, bound and helpless, whimpers as Mona delivers stinging lashes with a leather whip, turning her ass a deep shade of red. The intense whipping session culminates in a passionate lesbian kiss, their bodies glistening with sweat and juices.