Alien that shifts to suit your desires (MxM)

[slytherindoctor]

Shamelessly stolen from: https://www.bigfinish.com/releases/v/aliens-among-us-part-1-1665

This is just a basic idea. If anyone is interested, I'd like to talk about expanding on the idea and making it more specific with input on the plot from the both of us. Especially in regards to the backstory of the alien and where they end up now. Only M/M for me, of course, but feel free to also steal it.

The basic idea is the existence of an alien, a bio-engineered life form, created by some alien species or another. This bio-engineered life form automatically changes shape and partially personality (because they do not actually lose their entire personality) to match someone's sexual desires. It is not intentional and can not actually be stopped. Their entire biology changes when this happens, it's not just skin-deep. The life form has spent hundreds, perhaps thousands, of years in slavery. And now is a slave to the current owner. Whoever that may be. Setting and characters are flexible. This is just the basic template. If this idea interests you, pm me.

Note: I don't want to take this in any sort of furry or anthro direction. No animals. Just people.