
They don't get pregnant knot usually happens when inserter alpha want to have kid with someone it doesn't matter it happens during rut most of time so when seme alpha do it with other alpha according this manhwa logic he also releases his pheromones which is dangerous for uke Alpha but he enjoys it though, so Knott area get bulge by enlargement of dick and bind around in the stomach which is painful till seme alpha get soften till then they have to wait at least 10 minutes to calm down. Otherwise it would be painful for thd uke alpha. But it still hurts that's why uke alpha ask for kisses to release pain kinda distraction

It happens in most omegaverse like uke alpha become omega slowly cuz seme alpha cum inside him lot and they do sex without condom so that semen lead to changed in uke alpha's hormones but I don't thinks this manhwa going to follow that concept considering how rough and strong alpha uke is his body is rejecting seme alpha's pheromones it couldn't happen but then who knows.
I'm sorry but I have no idea about what happens when an Alpha knotted another Alpha? thx u :)