Aw, it's Darth Fuzzy Tail vs Jedi Master Squeakers!
During a particularly confused and depressed phase in my early university years I was "writing" a book about a guy (me, obviously) who has the ability to take over someone's body by using telepathic powers to swap minds. It was the ultimate escapist fantasy, I hated my life and living for a short while as someone else seemed like a wonderful release.
He ends up becoming obsessed with a fellow student (you guessed it, a woman) and decides to take over her life permanently. Of course it doesn't go as planned and "his" first experience of a period really weirds "him" out and, in other parts, lesbian fantasy scenarios ensue. (I use "him" and "his" because, I didn't write it with that character being trans* even though it's pretty obviously the case in hindsight.)
Gosh, haven't thought about that in so long, it was a pretty dark piece of fiction, I tried writing it at a time I was miserable about myself and my life without understanding why. I put down the pen because it disturbed me too much, but thinking about it now, what a cry for help it was!