Mia Foster, the office slut, is bent over her desk, her step-sister watching lewdly as she spreads her legs, revealing her red-stained panties. The sister can't resist, leaning in to taste Mia's menstruating pussy, licking and sucking hungrily. Mia, loving the attention, grinds against her sister's face. The sister then fucks Mia hard, their bodies slapping together, until they both cum, Mia's pussy dripping with their mixed fluids. They collapse, Mia's panties soaked, as they catch their breath.