It's a cold autumn day in 1985, 14 year old Bear steps off his schoolbus and takes a breath of fresh air, He is quite large for his age, standing at 6' 4" and 313 lbs, he wears a blue T-Shirt that hugs his body tightly and exentuates the size of his belly, his backpack hanging off one shoulder.

"And that's another friday done" Gruff says as he moves along the sidewalk, his knees pressing together with every step as his full bladder jiggles; You see, Gruff hates public bathrooms, so much so that he'll hold it in all school day so he won't have to use one. He waves to his friends as the go their seperate ways, moving quicly and trying to get home as fast as possible, his belly and boobs bounce with every anxious step.
He takes the turn to his home, his mother's car absent from the driveway.

"They must be gone" he thinks to himself, his parents often go on monthly dates leaving the home to him for a night.
Gruff quickly ascends the stairs and enters his unlocked doorway, flicking on the light and closing the door behind him, a feeling of calm before a deep sense of urgency overcomes him, grabbing his groin as he whispers "Oh sheeit, I gotta go!" the bear jogs up the stairs and intentionally passes the bathroom, not even giving it a second thought - Rather he immediatly enters his bedroom and closes the wooden door. The teen boy shuts his eyes and smiles wide as his heart beats ever faster, a wave of adrennaline spreads across his body as a dark wet spot spreads across the fabric of his blue jeans, dripping down his legs and puddling around his feet as Gruff gives a content sigh.

His member grows taught and hard beneath his now-soaked briefs, the boy rubs his groin and gives a quiet moan of euphoria, his obese belly rumbles loud before his lifts his bushy tail, a bellowing blast of ass echoes forth, seconds pass before the trumpet ends it's note as the air grows rank, smelling of rotten eggs and sulpher.
The bear takes a deep breath, gagging at his own stench - "I really think I've outdone myself" he says, before his obese belly is met by a loud rumble and deep churning sensation, he lowers to his knees and sets into a doggy position, his hands resting in the puddle of piss. He grunts and bares his teeth as the seat of his soaked jeans begins to descend, a thick creamy log of shit expelling from his tailhole and filling his underwear.

"These things are ruined" he thinks to himself, continuing to rub his rock hard member through his wet pants.
"I'm so filthy, I'm a dirty boy" as he pushes out the last of his waste, the bedroom now reeking beyond belief as he sits back on his mess, squishing it between his cheeks, rocking back and forth to spread the poop as far across his nether as possible.
Gruff moans out a strained "ohhh fucckk" as he squirts warm white cum into his yellowed underwear, continuing to stroke his cock as he stands up and runs his hand across his ass - "I really did a number on these things" he sats before exeting his bedroom, going downstairs and sitting on the couch, casually turning the TV on and finding Star Trek, relaxing back into the couch cushon as the mess squelches beneath his weight.
"Eh, I can clean up tomorrow"