You like this pig life. You don't want to go back to humanity. The mayor comes by again to visit his barn. He looks right at you for several seconds, then just smiles and moves on. Your disguise is perfect! You almost can't believe it.
You just stay in the pigsty. After a while you forget it's a disguise. You're just a pig now. When you finally let go of yourself, your nervous system relaxes completely. You release your pig shaped contortion. No longer do you thrust and twist your face into the parody of a snout. You stop kneeling around on all fours. You still roll in the slop and oink and squeal, but you're doing it like a man would instead of like a pig. The mayor comes by again and he seems even more pleased than before when he sees what you're doing.