Pre-TFA. Sometimes Kylo likes to feel pretty. If the crew luck out and get some shore leave, he'll break out his best lipstick and nicest dress, and spend a bit of time on the mostly empty Finalizer strutting his stuff. He's clearly not a beautiful woman, and those muscles are pretty obvious, but since nobody has ever seen Kylo Ren's face, he could be ANY dude in a dress.

Except, Hux meets Kylo in drag, and falls head over fucking heels in love. He's also completely oblivious to who he's hitting on, and damn if that attention doesn't make Ren feel pretty!

I'd prefer Kylo to identify as a male who happens to like dressing up, but beyond that, you can go wild with this prompt.