What is Forever 21 and Will I Regret This?

Last week I went over to a girl I like's dorm room and she wasn't there. I guess I was kind of rude to her roommate and 4 friends. They had a lot of fun at my expense. They grabbed me and forced a dress over my head, tied me up with a pair of panythose and a bathrobe sash and they gave me a makeover and painted my nails. They took a ton of pictures. They've offered to destroy the pictures if I go over this weekend and model some clothes and cooperate completely. I was told I'd have to come alone and be extremely agreeable. I really want to destroy those pictures before any of my friends see them. Should I go over this weekend and agree in exchange for the pics they took? I think they plan to take more pics, but at least they wouldn't be as embarring. Is this a trap? They made a joke about me being only 20, but having a forever 21 dress that they can't wait to see me in. I take it this is a store and not a style?