One day I got lucky to find my stepsister watching a gangbang video where she was even enjoying the twerk on

Found my 18-year-old stepsister in front of an adult video, it was a bring a friend to bang type of scene, including anal. Startled but horny, I did so, feeling and tasting her big tits big ass and 18 year old European amateur fantasies. This event was wild and unforgettably so.