The younger sister, a bratty 18 yo, enters her older brother's home gym while he's lifting heavy weights. She begins to tease and distract him, playing with his balls under the guise of "accidentally" brushing against them. As he struggles to maintain focus, she escalates her antics by climbing onto the weight bench and grinding her pussy onto his sweaty bicep. Her moans only fuel his anger, causing him to violently yank a dumbbell from the rack and chase her around the room. In a fit of rage, he pins her down and roughly rips off her clothes before aggressively penetrating her soaked pussy. Throughout this whole ordeal, their parents are oblivious to the sexual assault happening just feet away.