"The horsey one!" Ruben said like a joyfull child.
He picked up the horse themed diaper. It had a plastic front on it with a cartoonish picture of a brown horse.
He unfolded the diaper and put it on the floor. Quickly stripping himself of his underoos, Ruben laid down naked on the diaper and pull the front over his crotch, the diaper was waay to big for him, so he struggled to apply the tapes.
"Come on you stupid thing" Ruben frustratedly said. He couldn't do this alone he thought as he laid back down on his back to get his breath.
"Okay, one more try" Ruben said out loud, but as he rose to reach for the tapes again, he noticed that the diaper was now fully on.
"Wait, what?" Ruben said confused. He stood up and looked down at the massive diaper. Still far too big for Ruben, the diaper somehow still stayed on.
Wanting to see how it looked and not noticing that the area of his crotch was getting warm, Ruben waddled towards his bedroom mirror, but fell over. The diaper separated his legs too much to be able to normaly walk.
Crawling like a baby, Ruben went towards his bedroom, feeling his ears itch, but to distracted to pay attention. When he reached his door he stood up, noticing that the thickness had reduced a bit and that he could walk a bit easier, he waddled to his mirror.
Upon seeing his reflection Ruben let out a whinny of happiness. He had grown again! Looking back at him through the mirror stood a boy, with some signs of early puberty, probably around 14. Happy with the growth, Ruben then noticed his ears.
Standing higher on his head, were two pointy horse ears. After admiring his new ears, he finally noticed that once again he had peed his diaper. Embarressed Ruben said "I hope that this has nothing to do with my bladder...." as he rubbed the front of his nappy.
Not long after however, Ruben felt an itch coming from his back, stretching all the was to the bottom of his head. Reaching out with his arm to scratch, he felt hairs growing out of his neck.
Turning his back toward the mirror, Ruben watched as a dark blonde mane grew out of his body, turning his hair in to the same colour.
That was when Ruben also noticed the little bump growing out of the bottom of his spine, just above the edge of the diaper.
The appendage grew and grew as dark blonde horse hair appeared out of it, not stopping until it reached his ankles.
"Wow, I have a horse tail!" Ruben said, as he grabbed the long blonde tail in his hand. As he was admiring his new tail, Ruben felt a bit wobbly as if his legs were no longer as steady as they used to be.
Ruben carefully sat down, making sure his didn't sit down on his tail, Ruben saw his knees started to invert. His toenails darkend and fused together, as his feet turned into hooves.
Carefully standing up, he felt dark brown hairs grow out of his legs. "This looks greeaat" Ruben neighed, as he looked back in the mirror.
Ruben was now a horse satyr, with horse ears, a mane, tail and horse legs.
And of course a diaper!