Derek is being pressured by his family to pick a mate, and somehow stumbles into a choice that they didn't expect and aren't sure they approve of....

Omegas are inviting. Warm. The heart of pack life. Tsuna never believed he'd be any of those things. (Omega Tsuna, warm and wonderful but entirely unaware of it, unwittingly draws others to him and inspires unwavering loyalty.) No Mafia. Tsuna's "Family" is just his patchwork pack of similarly damaged children. Lots of platonic pack feels and bonding. Endgame Tsuna/Hibari.

Evgeni Malkin is thirteen when he soul bonds.