So my partner knows I really enjoy omegaverse, so we eventually ended up developing an AU for Rune and Sigil, for the most part keeping their appearances and personalities the same, but tweaking their traits a little to fit an alternate timeline where the world isn't absolutely screwed lol
We used their "real" names from their Code Vein selves, though I opted to make this version of Sigil full Japanese instead of a mix.

Mikuni "Miku" Hoshino (Sigil) is a recessive omega, as well as an andromorph, and enough of a 'late bloomer' that him and his family assume he's just a scrawny beta at this point. He's been an actor since childhood, as his whole family has a history of mainly theatre but he's been in a couple TV dramas as well.
Kohaku "Haku" Amir is a dominant alpha and a newcomer to the entertainment industry, originally working as a host and bartender until he got scouted by a modelling agency. He's slowly branched out to acting as well, doing roles in tokusatsu shows and some small voice roles.

The two meet when they both happen to be cast as the main couple of an upcoming BL drama CD. Haku is overly friendly and flirty towards everyone, and despite being Miku's junior he loves making passes at his small, baby-faced senpai. Particularly because Miku is a huge tsundere and adamantly shoots down any advances, as well as wriggling away from any kind of skinship as fast as possible.

Haku feels naturally drawn to Miku right off the bat, although it's not exactly conscious. Miku has never been sensitive to pheromones, but having to work in such close proximity to a dominant alpha starts to slowly affect his dormant omega nature...