Responses
they aren't stepbrothers here but
https://www.mangago.me/read-manga/raising_beta_winnow/
Antimoral omegaverse is about stepbrothers
Haven
Fantastic pheromone
Egoism
Pond with flowers
Ps. Psycho abo - lima syndrom, pheromone babY
I'm finding this bl like they are step brothers, it's omegaverse, then the beta has one sided feelings for the older Alpha, then suddenly the beta turns to become an omega something like that, it's a short bl