I love all of your animation. I think I like this one best with the flutter o the eyes. I just would have liked to see a couple of seconds more of what led to this point. That said the moment is perfectly illustrated.
Again I see this as the transformed male. S/he gave into the intense female body senses and gave her first blow job in a totally trance-like state only to have the cum flowing down her throat break the spell and shock of what S/he had done.