Yea, I've read that and other stories where Beta impregnated an omega and I actually like those stories since it's usually endearing like 'fk alpha omega bonds, I like u' and the child is the icing on top. this pheromones of omega to alpha just confuses me because it doesn't logically make sense to me unless theres some recessive traits involved T_T
Same way those stories that have characters go from alpha/beta to omega have them change you get exposed to too many alpha pheromones at once (usually by being bitten or cummed inside of). And I guess they just grow a womb??????? Although I don’t know really understand the going from omega to alpha maybe it just works the opposite way from alpha to omega (though that doesn’t really make sense either since he was an omega to begin with) but that’s not something I’ve ever seen before in any story or fic I’ve come across. It’s omegaverse though men can get pregnant it’s not supposed to make sense.

I dont get how too much omega pheromones from the older brother would turn him alpha, like huh?? wouldn't that instead make him *more* omega, such as making him present as omega earlier? maybe I'm overthinking it and am just too used to other tropes