How are you gentlemen. All your tentacle are belong to us. You are on the way to domination. You have no chance to survive make your time. Hahaha. :)
Possibly already suggested and a turn off for some but I feel it is thematically relevant. Perhaps harder to make work. Stuffing the women's wombs with spawn(eggs/fertilization etc.). After all we are an Elder entity who seems to draw strength from all manner of sexual energies.
I think most of the other relevant ideas have been covered at this time...