Rob could not describe how wonderful it felt to mate as a boar. He actually couldn't, his mind wasn't thinking on a human level. With each thrust, with each grunt, he felt less and less human, more and more pig. And with good reason, too. The act of mating was transforming both he and Mary further and further, taking the very last vestiges of humanity away from them.
Jess couldn't help but watch in helpless jealousy as her best friend finished her transition of species in such spectacular fashion. She found herself wishing she had been chosen first, that she was the one getting nailed by this boar, this boar named... named... what was his name? Name. It was more and more difficult for Jess to think.
Finally, they were done. Completely done. Spent sexually and no longer human by any definition of the word. The boar climbed off of the exhausted sow's back and allowed her to lazily flop over to her side, breathing heavily, contented.
He steadily approached Jess, warily, as she was still human to a certain degree and he was not. However, all she had to do to make up his mind was present herself. Once she did, he was upon her, and Jess finally gave way to the sow...
When all was said and done, it was a boar and two sows who slept soundly in the kitchen that night, no trace of the human beings they had once been remaining...