Caught masturbating in their shared bed, a stepsister begs her brother to join her. He agrees, and they explore each other's bodies, her small hands stroking his massive cock while he fingers her wet pussy. She helps him fuck her ass, moaning and pushing back against him. He fucks her hard, making her ass red and sore. She cums, her body convulsing, before he pulls out, his cock slick with her juices, and cums on her ass.