Cheating with Mom while Gf Studying

Mark is at his girlfriend's place studying for their final exams. She's upstairs engrossed in her books while he sits on the couch, struggling to concentrate. His eyes wander to the front door. His mom, who's supposed to be at work, unexpectedly walks in. She's dressed in tight black clothes that hug her curves. Shocked and turned on, Mark clears his throat, trying to hide his arousal. His mom, sensing his discomfort, playfully teases him, asking if he's seen something he likes. She starts unbuttoning her blouse, revealing lacy black lingerie underneath. Mark can't resist any longer; they start making out passionately. His mom climbs on top of him, grinding against his erection. They moan in pleasure as their role-playing intensifies. Sudden ly, the weather changed from sunny to rainy.