That was when Alison discovered her superpower: the enchanted essence of her blowjobs. Never had she known the power she held until that day she gave a huge demon a 4 hour orgasm! No doubt it was amazing, as she drained him thoroughly of his demon seed in one go. He had fun...but his facial expression hasn't looked the same since.
For me, it's an equal share of options 2, 3, and 4; but given that this poll only allows for one selected answer, I went with demon physiology -- not knowing that it was by-far the most-popular answer 'til after I'd clicked "vote" in order to lock it in!