Back story I had been friends with my current girlfriend for years before we started dating. I had had a crush for a long time but thought it was just a friend to her. She's bi as am I, we were doing our usual thing getting ready to head out and she was getting advice on what to wear from me. When as a joke I put on this really short skirt she had, it was so slutty so started teasing her with it on usual friend things. When she made a comment about "what a hot girl I would make" and slapped me on the bum. There's a lot more to the story but...

3 months later we were dating and I've been dressing up with her ever since. She loves my feminine side and I am beginning to love it too