I like that concept; they start as the same person, then they grow into separate selves. It would make for a character with interesting development. I would love to see more OCs with multiple heads using a telepathic link, especially if that link is going to be used for pleasure.
I'm so glad to hear that you absolutely see the vision. I think it would be fun to watch them try to combine their kinks together, especially ones that initially seem at odds. It certainly could make for some interesting scenarios, like using aphrodisiacs on a voodoo doll or a harness made of tentacles.
Just going to update that I actually searched through a few porn sites to see if there was any art of using aphrodisiacs on a voodoo doll and they all turned out to have nothing, so I guess that one is an original thought.
Gotta think it trough, but could make a really awesome character!