"I'll pick the Bull one!" The little boy said!
Ruben reached in to the box and picked the first bovine looking diaper he could find, not really paying attention and without carefull consideration. The diaper he chose, was a black and white diaper, kind of looking like a cow print. It had a picture of a cow with big horns on the front. If the boy had paid any attention, he would have also noticed the picture of an udder, on the other side...
Ruben swiftly pulled down his pants and unfolded the diaper. "I'm gonna be a big bull!" The boy said, not noticing his childish mental state, as he laid down on the diaper. The diaper was a bit too large at first, but seemingly somehow fit the little boy perfectly, as the tapes were taped on the front.
"There we go, now we just wait for it too work!" Ruben said as he pulled himself up from the ground and waddled out of the basement, up the stairs.
A couple of hours passed, without event. Ruben boredly watched cartoons on the couch, the big diaper still between his legs, when he felt a bit of a stomach pain.
"I think I'm gonna lie down" He said, his voice noticeably lower then before, but the boy didn't notice.
Waddling to his room, his hands gripping his tummy, it wasn't until he noticed his reflection that he found out he had grown again.
"Hey, that's at least a good sign!" Ruben said with a grimace, stomach gurgling.
Then with a shock Ruben realized what was happening in his stomach, as he rushed towards the bathroom.
In a panic he fought to take the diaper off, but it was too late, as a smelly warmth came out of his rear and in to his diaper.
"No, no mooooo" Ruben moo'ed, as the smell of cow manure entered his bathroom. He couldn't stop it, as a large amount of pressure was released in to the diaper, which managed to hold it all in, but it grew bigger and bigger.
Bending over, holding himself up by the sink, Ruben held his head down, in a mix of shame and panic, that was when he saw his legs looked funny.
Their shape was still human, but they looked like they were covered in white fur, with black splodges. Ruben looked up in the mirror, his ears wear still in the same place, but they were bigger and pointy and covered in black and white fur.
As the pressure in his rear finally subsided, Ruben managed to carefully stand on his... feet? Ruben looked down, he could still kind of recognize the shape of his feet, only the front had completely changed. There were now black lumps at the end of his feet completely replacing his toes.
Ruben waddled back in to his room and out in to the yard, smelling like manure, hoping that the fresh air would help remove the stench. He tried to pinch his nose shut against the smell, but his nose had also changed more bovine, with huge nostrils and a leathery texture. Annoyed Ruben let out another moo. He definitely chose the wrong diaper.
He had to take it off, he couldn't stand the smell anymore.
He reached for the diaper, hoping that this time it would go off, and with success ripped off the tapes.
The manure fell on the floor, leaving a massive cowpad. The diaper was once again, completely clean and neatly folded.
Ruben tossed it on the patio deck, hoping he wouldn't have to see it for a bit, as he was a bit upset, about what had just happened.
Feeling pressure building up on his forehead, Ruben wanted to feel his head, believing he was growing horns, but was distracted by his crotch.
Ruben's heart sank. His manhood, was completely gone, replaced by a flat piece of pinkish skin. Rubbing his crotch, the skin felt off, like rubber. Desperate to find his parts, Ruben was in for another shock, as his hands reached between his legs and a spike of pleasure reached through him.
Ruben instantly knew what it was, as he..... SHE explored this new part more, not noticing the piece of pink skin expanding.
"I'm not a booooooll, I'm a cow..." Ruben mooed softly, scared of her new changes.