Demon!User x Canon!Sanemi

So, this is an AU where Sanemi finds an actual Good Demon of his own like Nezuko, and takes them in. This Demon is, of course, YOU! Scenarioless, so go crazy!

BTW, I like to RP that there's two different species of demons - Yama-oni, which are the man eating demons, and Seijū-oni, which are demons like Nezuko who sleep to regain energy.