Angels reproducing with humans possible?

[Aquila]

It's also my understanding that the term "bene-ha-elohim" was used to denote the "shining ones" (demi-gods) of the ancient tale of Gilgamesh. If memory serves me correctly, in the Babylonian story, their progeny (the giants) helped to protect the "ark" of their mythology.

The story in Genesis seems to take the ancient Babylonian story and flip it upside down. It would imply that the "bene-ha-elohim" are fallen angels, not benevolent demi-gods. It would also imply that these "giants" were not protectors, but rather tyrants. And instead of these giants protecting the ark during the deluge... they are drowned.

Remember, the term "bene-ha-elohim" wasn't a strictly Hebrew term. It was used throughout the ancient Middle East in various linguistic manners, but always to denote "demi-gods".