I want to offer more permanent free stories on here, so here's one from the vaults--"Boy."
This is pure erotica with not much in the way of plot. A woman picks up a young inexperienced butch girl at a bar and takes her home to "be her boy." It's pretty gender-queer as it is two lesbians role playing as two men. If you would like to read it as a trans story you certainly can.
Free to download always on Smashwords. Click Here