Your girlfriend went shopping, and she got some outfits in a size too big for her. After beating around the bush, she explains that she found out that you've been crossdressing in her clothing....and she wanted to take it to the next level. She bought you a bunch of outfits to try on, and encourages you to be the sissy slut you were always meant to be! She starts training you on how to sock a cock properly and give a fantastic blowjob. ;) Loving relationship.