I am sorry but there is nothing that supports your idea about Angels, fallen or otherwise having sex lives or reproducing.
I know that as a human with sex and reproduction being such a big part of our lives that it is hard to consider a spirit being that does not but that seems to be the way He made them.
I will note in both places it references Sodom. As the destruction of Sodom was after the flood and you are apparently using their wickedness as some proof that these mythical hybrids existed God either missed some or fallen angels are still having sex with human women and reproducing.
Which one is it?
Genesis 3:15
15 And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
I just love it when the ignorant demonstrate their stupidity ... Since when does a snake have ‘seed’?????? Parable of the FIG tree!!!!!
Both passages link angelic sin to “going after strange flesh,” using the Sodom comparison as a type of illicit union, not as the same event. Early Church Fathers such as Tertullian, Justin Martyr, and Lactantius understood it this way, and modern scholars like Michael Heiser have shown that bene ha’elohim (“sons of God”) in Genesis 6 always refers to divine beings, never humans.
You don’t have to accept that interpretation, but it isn’t a modern invention—it’s the oldest and most consistent reading of the text.