You said that the
Grigori had a human appearance and that
their size was greater than the
giants. It is not possible for
someone greater in size than a giant or
even a giant to have sex with a woman
because the Grigori's procreation body
parts would be too huge.
I still believe that
the fallen angels had sex with women by
shapeshifting down to the size of a
normal man with normal sized procreation
body parts. If the fallen angels
had no seed, is it not possible that
they went into their wife and removed
some of her eggs and then put some of
their dna inside the eggs and then put
them back into her womb. In other
words they cloned themselves. Just
another possibility.