That male pig over there looks pretty damn good. You see that it is sporting a long erection. You don't know why, but you want to go to that pig, and feel him... You climb over the fence, into his sty. Once you've done this, however, you suddenly feel incredibly strange.
You instinctively take off all of your clothes. You see your feet, turning into hooves! Your fingers, too, begin to clump together and form hooves. Not only that, but your groin starts to hurt. You squeal as your dick recedes into your body, creating a vagina! Your nipples also multiply, as you feel 6 more lumps forming in a line along your torso. Your face moulds itself into another form, as the mouth and nose fuse to form a snout. Your hair all falls out. Your ears move up your head and become pig-like in shape. You grow fatter and fatter, until you can no longer stand on two legs. Your skin becomes rough and pink, and a curly tail pops out, your anus moving just under it as well as your new vagina. You're a female pig now. A sow.
The pig looked even more attractive now. You feel like you want him inside of you... You want to bear his piglets... And he wants it. You offer him your sex. He heaves his plump body onto your back, and penetrates your rump with his maleness. He thrusts in and out, again and again. He keeps on doing this, rhythmically, until- You feel bliss as his cum goes deep into your womb. He comes off you.