Possession
You have a friend, Natasha. She's gorgeous, and she knows you're attracted to her.
She's told you she's not interested, but that doesn't seem to stop her from getting you riled up.
At first, it was just teasing you with tiny glimpses of cleavage, rubbing her breasts against you a bit too close with a knowing grin. But as she enjoyed your reaction, things escalated. Flashing you, rubbing you in more intimate places...but never progressing beyond that.
Eventually it all came out about your fetishes - cuckolding, femdom, teasing and denial.
"Well, I don't know that I could cuckold you, because I was never yours to begin with. But I've been enjoying our little games... are you up for taking it a bit further?"
And that's how you ended up here, getting a more intimate view of her than you ever dreamt possible - in anticipation of your most daring game yet. Natasha hit up a booty call of hers, intending to put on a show for you... as long as as you promise to obey her rules.