As Jack gets even bigger, your crotch stirs more and more. "Damn..." That's all you can say.
Jack's shoulder bulges out. Although it looks plump, you can tell it's not all fat, big muscles are moving under the thick fat. His paws are getting wider and all four legs get much thicker. He is definitely not just getting fatter but developing muscles as well. You then realize that his body is adjusting itself to support his increasing weight.
You walk around to check his ass out. It's huge, fat, wide and round, but well-defined. A big furry muscular ass covered with very thick fat. Actually, you think to yourself, it looks even hotter than before. It's the sexiest ass you've ever seen!
You strip naked quick and jump into his ass. Wiggling your face and burying your face deeper and deeper into Jack's bear ass, you insert your arm between his thick thighs and grab his member. "Whoa!" Jack exclaims in a husky voice in the sudden pleasure.
Jack stops eating, and turns over on the floor opening his legs as wide as possible. It's not really enough room for you as his thighs are thick, but you continue jerking his big cock and insert your hard manhood into his hole. It's really warm, fuzzy and tight. "Oh Jack, I can't...!" You shoot the load immediately, but your cock loses none of its hardness. In fact, your seed mixed with Jack's fur, and the feeling on your cock becomes even better.
You can't stop fucking Jack anymore. "Fuck me!" You grab Jack's huge member with both of your hands and start jerking it off even harder. Stroking it down and pushing your cock hard and deep into his ass, stroking it up and pulling your cock out - you fuck him rhythmically.
Another orgasm is building up inside you. "Oh god, I'm coming!" You shoot another load inside Jack's fat ass, and you feel Jack's cock inflates. Right after you bury your cock up in his ass with might and stroke his cock down to its base, Jack shoots a huge amount of cream on his belly, roaring loud.
You are now spent and exhausted. Slowly you pull your semi-hard cock out of Jack's ass, cuddle up with his furry large body, pressing your sweaty ass against his cum-coated belly, and fall asleep satisfied.
However, Jack is still wide awake. He is still horny and wants to unload over and over. "Hey, wake up, let's do it more!" You stir in your sleep, but don't wake up. Jack tries to jerk off and even fuck your human ass - sadly his body is too big. He can neither reach his cock nor fuck you, because his fat belly gets in the way.
He still tries over and over to satisfy himself, but eventually falls asleep too unsatisfied and frustrated.
Next morning, after a few rounds of sex, Jack expresses his desire. "Hey, dude, why don't you become a bear like me?" "Huh? Why?" "Well, you know... you're too, um, small for me..." "What do you mean?" "I wanna fuck you in the ass, and I wanna get fucked harder..." "You're saying my ass is too small?" "Yeah, but not just your ass, you know..." You're shocked. You thought Jack was enjoying getting fucked by you, with your average- sized human cock.
"Fine, what-the-fuck-ever." You quickly put on Jack's clothes and storm out of the barn, then get on the van. You're still angry (and embarrassed), but his idea slowly sinks into your mind as you drive back to town. Becoming a bear? Like him? Hmm, maybe it's not such a bad idea after all...
You finally decide to head to the store, The Second Skin, to explore the idea.