Fighting back the urges, Derrick realized he couldn't get past the pack of animals that had formed behind him. That left dropping down into the thick mud and slogging his way out through the wallow. Before he gave in to other desires, the boy jumped down into the thick brown goo. It was deeper than he expected, and he stumbled and fell face-first. He pushed up frantically, narrowly avoiding the big male. Backing away, he ended up sprawling backwards over the sow and landed in the mud again. Getting up was harder this time, and he wiped at the mud clinging to him. It wouldn't come off!
Confused, Derrick pushed at the heavy layer covering is chest, only to discover it was thick, bristled flesh! Suddenly aware of what was happening, he managed to slog a few steps before balance changed and he fell forward again. A loud grunt escaped, followed by a squeal as he tried to cry out. Already closing up into cloven hooves, his hands disappeared into the muck as his neck stiffened and forced his face up. Derrick twisted around to see if he could get out of the wallow the way he had come, only to find himself staring at the sow's rump. He suddenly felt very aroused, and from the feel of it, there was a lot to get hard.
He was getting heavier and larger by the minute, and understood that he was becoming a boar. But the sow needed him, wanted him, and he needed and wanted her. His thoughts thickened, and the idea of living to eat, sleep, and fuck filled his mind. Instead of fighting the urges, Derrick moved to the sow and heaved himself over her. His long, oddly shaped penis found her slick cunt and he drive in with a grunt. The female clamped around him, and his first sexual experience ended up as the intense and very long-lasting orgasm of a boar.
When he finally jetted the last semen into the sow, Derrick slid off and collapsed on his side in the mud. He was totally spent, and felt more fulfilled than he had ever managed during his human life. Mating was important, critical, his purpose for living. Derrick's human past remained, but it was of no importance to his new-found identity. He was a hog, and that was all that mattered.