ANON-KUN THIS IS INCREDIBLY SPECIFIC????? okay, if I were given this as a prompt, probably what I would do is keep Yuuji and Gojo's relationship stable/"healthy", and explore the relationship between Yuuji and his family. (and contrast this with Gojo's relationship to his family)
I would make it a situation where Choso and Sukuna clearly care about Yuuji, but it's sort of a thing where they view him as the "innocent baby brother who can't make decisions for himself," and understanding that it would be hypocritical of them to hold Yuuji to higher expectations than they can actually achieve themselves. It'd be the sort of thing where you're worried the choices someone you love makes are going to hurt them, but you see that it's made them genuinely happy, you rethink that. I think in the end Yuuji's brothers would prioritize his happiness (or. at least Choso would LMFAO)

Honestly I think Sukuna would be like 🤨 "you're doing what?" but ultimately not really care about what shit decisions Yuuji wants to make, maybe just laugh at him/mock him a bit. Gojo would probably get on his nerves though, so that's a different situation LMAO.

I think it would be interesting too for Gojo to actually like Choso and Sukuna, because they'd be a family that actually is responsive and loving to Yuuji, which is very much unlike how I imagine the Gojo family to be (very cold and calculating). I have this headcanon that Satoru's mother was overbearing and particularly emotionally manipulative when he was a child (not so much once he got to be a teenager).