Only things I have so far..

Like in canon, Hadel is being abused and groomed by his adopted mom's boyfriend around the age of 12 (which puts him in year 1 of middle school).

Luca is a middle school teacher, who recognizes that Hadel is being abused and wants to take it into his own hands to save him (feeling doubly connected to him because he's blank, like in canon). Thinking about Hadel's abuse triggers him due to his own childhood abuse, which is probably why he feels soo... entitled? To take care of it himself rather than reporting it in like, a backwards way.

Luca is generally more creepy here than in canon (he kinda has to be for obvious reasons LMAO).

He essentially kidnaps Hadel on occasion. He frames it like he has a daughter and that Hadel often likes to spend the night at his home in order to have play dates and sleepovers.. or something like that, probably.

Ig an important side mention is Lu never fucks Hadel here, until he's 15 at least. For many reasons, but they do cuddle and kiss and touch a little. After their first kiss, Hadel asks if Luca is his boyfriend, and he says yes.

That's all I have set in stone really, not sure if he'll like outright kidnap him or eventually call CPS on Hadel's home (since Toluca is neglectful while, obviously, her boyfriend is abusive, that would make it so they no longer have custody and Lu could probably swoop in and adopt him as Hadel would officially become like, an orphan / foster child, just not entirely sure how to write it realistically).