1(Blue Lock)

An omegaverse Au where packs are fundamental for a person's mental and physical health.

Rin was born as an omega to the Itoshi family which wasn't totally well welcomed by tha family of mostly alphas and a few betas but they still took care of him with only Sae being actually what could be called Rin's pack(if Sae is a beta or alpha is up to the writer).

Things went mostly like canon with the siblings relationship but Rin forced himself to believe he and Sae were still pack so he wouldn't go down a spiral that he wasn't sure he could return from but after the match between Blue Lock and Japan U-20, Rin just couldn't force himself to do it anymore and losing the only pack he had ever known broke him.

Of course Rin tried to hide that he was packless but the moment he joined Paris X Gen, every member of his new team felt how broken Rin was and that he had no pack.

No one brought it up, they had all been taught about how to help a packless person(they all came from big packs and nice families unlike Rin) and bringing it up wasn't a good idea so the first night of them as a team they waited till Rin was a sleep to meet and talk about what they should do.

The consensus was that they all wished to help Rin but as they were from different packs they couldn't bring their packs to meet Rin so Loki brought up the option of them creating their own pack which they seemed interested but they needed to talk with their packs before doing anything else.

It took two weeks for them to finally start forming a pack between themselves(they did small gesture for Rin that would bring some comfort to Rin's omega but not enough to actually help him heal) with the authorization of who had been their previous pack leader(it isn't obligatory for an alpha to be a pack leader but it is pretty common).

Once they formalized their pack, they started their slow and careful courting of Rin(in pack courting not relationship courting...unless the writer wants them to be a poly pack then it can be both) which Rin without noticing was accepting the courting and getting better.

Rin was officially asked to be part of their pack not long before one of their games against another team and while Rin at first froze as he hadn't noticed the others were a pack or were courting him(he only has Sae as his pack so he didn't really know much about them) but in the end accepted as he hadn't felt as good as he did since before Sae left when they were kids.

Anything else that might happen like ships, Sae's reaction to Rin's new pack, how Paris X Gen being a pack affects their game, etc is up to the writer.