In this adult sibling role-play, I come home to find my sister on all fours with a pen inserted between her legs. She claims it is a lower-body tightening exercise, but the sight is too sexy to resist. I thrust into her raw, and her training-tightened pussy makes me cum almost immediately. Turned on rather than angry, she folds me back, mounts me in reverse, and guides my cock inside herself. We keep going without pulling out until repeated creampies leave semen overflowing from her pussy.