Rachel wasn't wearing anything, unless you counted the expression off bliss that was a result of the intense orgasm she had just experienced. Until just a moment ago, she had masturbated furiously to one of her exhibitionistic fantasies. The thought of running around naked outside, and being caught that way...
The reality was that she was in her room, door locked, shades drawn, and everything triple-checked to make sure absolutely no one could see her in her unclothed state. For all her fantasies, Rachel was a very shy girl. She had already begun to resign to the fact that her fantasies were just something she occasionally masturbated to.
But then she happened upon the idea of erotic blackmail. On an erotic story board, she found a reposted and recently completed story by a genius under the alias of hooked6, featuring a heroine that got blackmailed to expose herself in a lot of inappropriate places.
Being an independent-minded person, she at first objected to anyone being forced to do anything against her will, sexual or otherwise. But her mind wouldn't let go of the issue, and she began to include elements of coercion into her fantasies, placing herself as the (unconsciously willing) heroine/victim of some interesting new masturbatory scenarios.
She eventually realized that it not only turned her on, but would also help to overcome her shyness, at least in so far as it was eliminated as an obstacle to making her fantasies come true. Forced nudity was definitely her thing!
Some of the board's regulars had posted teasing comments about doing something like the blackmail club in real life. One of them even tried to develop a guide on how it would have to be done. While consideration of boring real-life problems was certainly less of a turn-on than exciting fantasy scenarios, it showed her one thing: This would work best if her blackmailer was someone she knew, like in the story.
Finding the right person was a no-brainer: She and her flatmate Michelle told each other everything, even their sexual fantasies. Rachel got dressed and went to Michelle's room.