Seeking one F to play multiple roles, or multiple F's to play each role.
Names are subject to change as you desire.
A Reverse Gang Bang
Sarah was dating a new guy, and boy was he a stud (Option: Boyfriend could be a black guy). Handsome and well hung, the sex was amazing and his stamina wore her out every time. No matter how much she made him cum, he was always hard and ready to go again. So she decided to show him off to her girlfriends, hoping that combined they'd finally be able to bring him to exhaustion.
She invites him over to watch a movie with her and some of her friends (3 other girls) that he's never met. As the movie progresses, she starts to turn him on and make him horny. He's shocked when she goes topless in front of her friends and pulls his cock out to give him a blowjob in front of them but quickly recovers. They soon start to have sex in front of the others, all attention away from the movie now, and he feels other hands touching him. Once his girlfriend has had her fill, the other girls - now naked as well - decide they want to go for a ride too and he ends up having sex with all of them.