Best friends Lily and Kitty are playing truth or dare when one of them dares the other one to walk downstairs in front of their respective stepbrothers while naked from the waist down. Kitty completes the dare easy, and leaves David feeling horny for Oliver’s stepsis in the process. The guys decide to check on the girls to make sure they aren’t doing any more stupid stuff, but when they find them eating each other’s pussies the guys end up swapping and fucking each other’s stepsisters!