Lesbian sister - a great chance to have a FFM threesome

Some people think that having a lesbian sister is a tragedy for the family, while others see it as an opportunity to have a threesome with her and her girlfriend, if they can pull it off. This guy is just gorgeous, because he sneaked into the bedroom unnoticed by his sister and her girlfriend and started peeping on them and masturbating. Of course, they caught him... and, of course, he started blackmailing the girls, so the stud's dream came true—he had a successful FFM threesome.