Your body is getting warmer and warmer again. You really don't want to gulp Jack's fattening ass syrup, but you are forced to eat it to breathe.
"Ahhh!" Jack has shot thick cum over and over on your growing belly. Dumping ass syrup and your heavy hot breath on his asshole are giving him an incredible sensation. Also, watching you grow is making him very horny. "Oh yeah, fatter, furball! Get BIGGER!!" Jack keeps shouting in ecstasy, shooting unending load and covering your fattening body with his ursine seed.
Your paws grab Jack's fat furry ass on your face to move him away. Even after knowing it's impossible, you are still holding it. But you feel it's getting harder and harder. Something is pushing your arms away from his furry butt. It's your chest, which is getting fatter and wider. You also feel your butt is growing larger and wider, pushing your lower body upward. Your back and neck fat is also getting thicker, pushing yourself and super heavy Jack on your face upward like a jack.
A new warm feeling has hit your upper arms and thighs. At first you didn't know what it is, then you realize your torso is too fat now and your limbs are getting buried into the mountain of flesh!
Jack keeps making you eat his ass syrup for hours.
All of the sudden, fresh cool air hits your face and Jack's strong musky scent weakens. Jack has finally moved his bear ass from your face.
He gently licks his own ass syrup remained on your face and growls in satisfaction. "It's done, dude." He grins at you.
You, however, can't move your face to Jack as your neck is too thick. You try to move your arms, legs and paws, but can't anymore. They are too heavy. All you can see is your own black furry chest, which swells right in front of your face like a mountain.
You are completely immobile and don't even know how fat you are. On the other hand, Jack is now a huge muscular bear. He has dumped all of his fat into your mouth and has no fat on his body anymore. You are well over a TON and 10 feet in height, the biggest bear on earth!