Yo, me too. I have been playing around with different ideas for this type of thing, mainly omegaverse, where Yuuji gets mixed up with a criminal Sukuna. He's usually possessive and makes Yuuji feel safe until a fight makes Yuuji try to leave him.

Sukuna decides that since Yuuji doesn't want him anymore he must want other alphas, and well - Sukuna can make that happen and get a good show at the same time.

Next thing Yuuji knows, he's stuck in a wall in some horrible underground brothel with a long line of unknown alphas behind him. Sukuna watches them have their way with him, using both his holes until he's too fucked out to stay conscious. Then, Sukuna goes to rustle him awake and ask him if he got the need to be fucked by other alphas out of his system.

Yuuji never said he wanted that, but now that he has experienced it, he can't get enough. He decides to stay with Sukuna if only for the chance of doing it again, and since Sukuna liked watching, it becomes their thing 🤭

I dunno, maybe one day I'll write it 🙈