Ooooooh okay this would be so much fun!!
I can imagine maybe little Yuuji who is a Baby Witch lol. He comes from a coven of powerful witches/wizards but he’s so young that he hasn’t really manifested his powers yet… and of course his brother (or uncle) Sukuna teases him for it. So one day, Yuuji decides to cast a summoning circle to prove to his brother that he CAN do magic!! Of course something goes a little wrong with the spell and he accidentally ends up summoning a demon… but not just any demon: The prince of Hell. Satoru stands there, this ageless creature of torment & he sees little Yuuji just pouting and on the verge of tears because he was supposed to summon something else completely. So of course Satoru falls in love on the spot and basically tells Yuuji that he has a binding contract (he doesn’t) to him and that Satoru has to obey every one of Yuujis commands (he’s already whipped). And the rest of the story would just be them getting into a bunch of supernatural hi-jinx and Satoru scaring the fuck out of anyone who messes with Yuuji and they fall in love the end 😂😂