The wolf tears your pants off till you're wearing nothing below you. You keep trying to run away but your mind keeps preventing you from doing so, as if someone was controlling your mind. You have a huge urge to take off your shirt, so you did.
The wolf's penis then crawls out of its sheath. You can see it's around the length of your arm, a really huge member compared to a regular wolf.
You kneel, putting both your hands on the ground, showing your butt and anus towards the wolf. The wolf plunges its penis into your anus, causing you to moan and yell in pleasure and pain.
It is pushed deep inside you. The member stiffens and gets stuck inside you. You try to pull it off, but your mind is still taken over.
You feel the loss of control for your arms, and you nearly collapse, but the penis inside you keeps you steady. You start to see the world around you grow, and at the same time, your mind tells you to lift your legs up behinds you. Your body is now being supported only by the wolf's long penis, which seems to have molded into your anus and your body.
As your body shrinks, the base of the penis grows larger, and it fills up nearly your entire buttocks. The wolf's sheath also seems larger, and starts to suck your buttock and lower body in. Your arms start to shrink, first your fingers, and then your hands, till your former arms, now just stalks of flesh, shrink back into your sholders.
Your neck is getting thicker, and your entire neck and body matches the size of the wolf's penis. Your head is now level with the wolf, and you find out how much you shrank.
Your entire body has turn into the wolf's penis. All that's unchanged is your head.
You shrink even more, now level with the wolf's paws. Your hair start to fall off. Your ears sank back into your head, but you can still hear things. Your nose also sinks back into your face and your mouth moves up to where your nose should be. Your lips disappear, and all thats left is a small opening. Your eyes move to the sides and also disappear, though you can still see.
You loose the complete control of your body, and you hang off the wolf's sheath.
The wolf walks to a nearby puddle so you can see what you have become. You are now a complete wolf's penis.