why is it that in alpha x alpha bls, the alpha uke always acts like an omega in heat?

this genuinely annoys me. i read it expecting an alpha x alpha dynamic, but most of the time it just feels like a label. these alpha ukes are no different from omegas esp during rut like they don’t even feel like they’re in rut. they’re always written as if they’re in heat. when alphas are in rut, they usually want to assert dominance, but in these alpha x alpha, they somehow don’t do that at all and end up being submissive as hell wtf