
Knotting is a phenomenon that occurs during mating (usually dogs, maybe wolves too I'm not too sure about that) where usually a very large amount of semen is released and kept from leaking out in order to get the female pregnant. In omegaverse, Alphas are capable of knotting during heat in order to get the omega pregnant. So that's what's happening ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄

No.. The sperm is gonna stay In the womb after he releases, so that chances of pregnancy is increased. That swelling is to clog the vagina (or asshole, in this case) so that none of it leaks out. Knotting occurs just a little before releasing sperm I think.. So that when the sperm is ejected none can come out. This knotting can last a few minutes or even an hour.. In that time the alpha cannot take it out of the omega womb. If you want an exact reference you might want study on how dogs do it.

Knot has different meaning but I explained within the context of this series. But in simple term knot is the result of tying something together, like shoelace, two string etc. There's also the tying the knot in reference to getting married. I hope I'm answering all your question. Feel free to ask more.
before marriage? knot on my watch