Not sure if this is allowed here, but I've got a story (still in progress) on a site called chyoa.com which is basically full of choose-your-own-adventure erotica. http://chyoa.com/story/the-ring-2/cover is the link.
It's about the main character (you, you can choose names for characters too), a college freshman, and your new roommate, discovering these two rings that transform you into hot girls. Yeah, the premise is kind of ridiculous, but whatever, it's meant to get you off.
You can add to the story too, since it's public, just create a new thread at the end of any section and write in your own choices for the main character.
Source: reddit.com/r/eroticliterature/comments/3dapq5/the_rings_choose_your_own_adventure_erotic_story