The boar on top of you fills your ass with his seed and you realize that, for some strange reason, you enjoyed what he just did to you.
Finished, for now, with sex the huge bristly boar lays on top of you and snores. He's still buried deep in your ass and you can feel that his cock is still twitching slightly, sending spurts of his seed into you. With his huge balls and probably even larger prostate gland, he's probably got a lot of seed to fill you per orgasm.
You're concerned about your cock getting smaller so you check yourself out and realize, your cock isn't shrinking, you're growing bigger. Your four fingered one thumbed hands are changing too. You notice that your four fingers are fusing into two longer fatter fingers and your thumb is growing fatter too. You look at the boar's hand and realize that soon, your hand will be as his is; robust, strong and with three digits, not five.
You feel many changes taking place, your gums are sore and you can feel the beginnings of tusks erupting from your gums. You can feel your body gaining fat and your nose beginning to upturn. Your feet, though you cannot see them as you are on the bed on your belly and the boar is still on top of and in you holding you down, are changing too. You feel your feet becoming hooves like the ones the anthro-boar walks on. All over your body your are growing boar bristles, some soft and some coarse. The last thing you notice is incredible pain coming from your genitals. It feels like someone has kicked you in the groin and you begin moaning loudly.
This, of course, wakes the boar.
"Ah... almost done with yer change I see!" He rumbles and begins to thrust into you again.
"It hurtsssss..." You hiss as new gut wrenching pain washes over you in a nauseating wave. "Like I've been kneed in the nutssss..." Tears stream down you porcinoid face.
"It won't soon, you're nuts are growin', that's why it feels like you've been kicked in the balls. Yer gonna make one fine Piglet for this here Boar Daddy." He thrust into you harder and you feel extreme pleasure. "Yer prostate is growin' too and me pumpin' into you hard should stimulate you into completing yer change."
The boar is slamming his huge cock into you and you do notice that the pain has subsided substantially. You're getting into this, really enjoying what's happening. You don't realize it, but thick corded muscle is growing beneath your new layers of fat. What you do realize is that your cock is extremely hard and seems to be expanding, sending shivers of pleasure through your porcinoid body.
The boar begins grunting and squealing and this turns you on. You begin to make the same noises and the vocal range of your voice progressively drops until it settles into a deep grunting bass. You're squeals are still high pitched, but your grunts are deep. Your thickly bristled barreled chest takes in deep whiffs of the boar's musk and sex scents and this pushes you over the edge.
You grunt and squeal as you shoot your load into the sheets, squeezing the boar's throbbing cock against your prostate. This in turn pushes him into overdrive and he shoots more of his hot seed into you.
Another thing you didn't know is that pigs have thirty minute orgasms, which is why the boar kept spurting his seed into you while you slept.
You feel warm all over and relaxed as the boar once again lays on you and begins to snore, his cock still jerking inside of you to the same rhythm of your own jerking boar cock.
You drift off thinking that before tonight you saw sex as gay and straight when in reality, what his boar has shown you is that sex is just sex... and you're his fat little piglet for now... someday, you'll be his lean muscular boar mate.