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Warning: 18+ Naughty Stuff

A good few hours after they had left him home alone, Rocky's parents stumbled up the stairs, his mother laughing and giggling as her husband carried her. Struggling to get to their room just next to Joe's, Rocky's dad suddenly stopped, seeing their youngest son's body arched beneath their eldest son's bed sheets. He seemed a little confused as he asked his wife, "Is that normal?"

Rocky's mom looked into the room, the warmth of her cheeks almost showing, "Oh come on, he misses his brother... I'm sure he won't make it a habit..." She grinned mischievously as she undid his pants, reaching in to roughly grab his crotch. Pulling him into the room, "Come on stud..."

Beneath Joe's comforter, Rocky had one paw firmly over his muzzle, stopping himself from moaning out as he humped his aching cock into the other. His hips spasm and he lost control all over again for the ninth time that night, hot, watery dog jizz spraying out of his piss slit, adding to the huge puddle already building up around his hips. Letting his straining six inch pup meat splash down into the mess, he bit into a pillow, breathing hard, nearly wheezing, his entire body covered in sweat. Lying there, absolutely exhausted, it hurt so bad even to make his abused dick pump anymore.

After a quarter of the hour had passed, Rocky felt the sudden urge to pee. Standing up, he wobbled towards the door, his swollen, chafed cock hanging between his legs. And then it hit him...the scent drifting with the wind that had just blown through the window. He asked himself, "What's that?" The urge to piss would have to wait. He followed the scent back to his brother's bed. When he kneeled, down, the scent grew stronger, hitting his nostrils like fresh paint, it was impossible to miss. Reaching his paw under, Rocky pulled out a pair of dark blue briefs with white lining. Holding them in both paws, he felt something crusty warn into the crotch. The stink was overwhelming. Licking his lips, Rocky lifted them to his muzzle and roughly pushed the crotch of the underwear to his nostrils.

The stink was bitter and almost overwhelming. Rubbing them all over his face, he wanted to be familiar with all the different smells. Flipping them over, he even inhaled the sweat stains where his brother's hole would be. It had the rich smell of body odor to it, but there was something unique about. The smells were like an intoxicating drug. As soon as he saw more underwear, the Doberman grabbed hold of them and rubbed them in his face, breathing deep, hoping one of the pairs would have a fresher stink to them. Rocky gave a long, drawn out moan, the way the musk of his brother's underwear had an effect on his mind was driving the rest of his body crazy.

And then Rocky felt it! There was a hard ache in his chest. Squatting on his knees, he dropped all but one pair of underwear. Despite the strange feeling in his body, he couldn't put that last pair down, drowning himself in the musk of his brother's ass sweat. His left paw went right for his crotch, his balls aching, throbbing. Huffing hard, he looked down at his young sac, covering his muzzle with his paw and the underwear to cover and dreaded moan. He watched, inhaling his brother's rich stink as his nuts swelled, growing to an unnatural size for a pup his age, right before his eyes.

The ache then seemed to focus on his chest, his pectorals bulging. Finally, he was forced to drop the underwear as his arms swelled and he lost control of his paws. His biceps swelled and he gritted his teeth, he wanted to cry out, but he couldn't let his parents find him like this. Soon came a ripple that he could feel throughout his entire body. Inhaling deep, his entire body was suddenly so sore; he collapsed on the floor, seeing one of his large biceps staring back at him.

Next morning, Rocky used Joe's dresser as support to stand. His eyes widened when he saw himself in the dresser mirror. He was bigger, not freakishly bigger, but bigger, like he had gone through a growths spurt in the last two weeks in a single night. "Oh wow..." Lifting his arms to flex, Rocky noticed something different, "I have pubic hair?" And it wasn't just little peach fuzz pubic fur, it was a decently thick patch.

Curious, Rocky leaned the tip of his muzzle towards his under arm, only to be hit with an overwhelming masculine body odor. He suddenly felt excited, the tip of his red dick poking out of his immensely thicker sheath. Feeling hazy, the pup's tongue hanged from his muzzle. Clenching his eyes, Rocky rubbed over his engorged nipples, both fat and the size of a penny. He sucked through his teeth, licking at his lips as he naturally teased himself, tweaking the oversized nubs. As one paw continued to tweak his nipple and the other moved towards his bubble butt, Rocky felt a strange aching coming out of his tail hole. Biting his bottom lip, he rubbed one padded finger over his throbbing pucker. And then another. And then finally, he inhaled deep as he pushed deep into hole, "AAAHH!" It hurt at first, but no matter what, his aching hole urged him to keep going.

With little warning, there was a loud creak off the floor coming from his parent's room. Panicking, he looked around before diving back into Joe's bed. His mom opened his parent's loud, creaking door before she stepped out, "Rocky...Rocky, are you still in here?"

Licking his lips, Rocky tried not to moan beneath the sheets, still thrusting his fingers in and out of his hole, "Ye...yeah mom..." He was surprised to hear his voice crack.

"Why don't you come on back to your room? I don't think your brother would appreciate you being in his without permission..."

Rocky was cornered, "I...I...can't right now mom..." Working his fingers deep, he pressed his teeth together, trying not to grunt.

His mom was about to ask why, but she stopped herself, "Oh...Ok." She was starting to walk away but turned around, "I don't think your brother wants you jerking off in his be..."

His voice squealed again when he cut her off, "MOM!"

"Sorry...!"

For the rest of his Sunday, Rocky cleaned up his mess, trying so hard not to lift up his arms and make a new one. By the time he was done, his under arms were caked in deodorant and he sat in his room, wearing a pair of sports shorts because they were the only pair he didn't have to struggle with to get on. He was confused about was happening to him. Joe had told him about going through changes...but nothing like this! What would his friends at school think...?

More to come?