As the morning sun broke shined through the window, directly in to his eyes, Ruben groaned, slowly waking up.
He sat straight up on his bed and slowly opened his eyes and gasped as he saw something had changed.
"What, did I change back?", Ruben asked to himself, looking at his hands in disbelief. "But how?", he added as he removed his bedsheets a bit to look at his behind, searching for his tail.
It was completely gone, his ears also returned back to human form. "Was it just a dream?" he pondered as he now completely removed the sheets, thinking it was all just a dream.
As soon as he removed the sheets, the diaper appeared again, with a picture of a cartoonish horse on the front. "Oh, not a complete dream then?" Ruben said, as he stood up to take a shower. Ruben walked to the bath room and reached down towards his crotch to remove the padding that hang, quite heavily, between his legs. However, it proved to be more difficult, since the tapes had disappeared. "Huh, where did those things go?" Ruben asked himself, now trying to remove the diaper like any old regular piece of underwear, but it wouldn't budge. "Oh come on, first you change me back and now I can't remove you? I just wanted to be like a horse!" he said to the diaper, desperate for something to happen.
And something did happen. "Oh boy, I really need to use the toilet" Ruben said, in a little bit of a panic. Desperate to urinate, Ruben wrestled with the diaper, until he couldn't hold it anymore and let it all go.
Immediately a tail grew out of his rear, and fur started to cover his entire body. "What the neeeeiiggghhh" Ruben neighed, confused and startled. He ran out of the bathroom, back to his bedroom, to look at his full sized mirror.
His toes fused and his nails darkened, turning back in to hooves. "Am I cheeeiiiggghnging back?" he asked himself, losing more and more control over his voice.
His knees reversed and his legs transformed once again to something more equine. His ears shifted back towards the top of his head and lenghtend.
Ruben, desperate to keep his balance held his arms sideways, as the changes seemed to have stopped. He was now completely covered in dark brown horse fur, head to toe. "This is weeiiigh" Ruben tried to speak, but his voice once again cut himself short, turning in to neighs, whinnies and brays.
What is happening, Ruben thought, scared by the aggressive changes. Before he could move however, his arms were pushed alongside his body, as they started to grow in size, his elbows reversing, just like his knees. His fingers fused together and turned into hooves. Overcome with disbelief Ruben held his front legs in front of his face.
Feeling claustrophobic, he quickly ran out towards the yard, almost tripping down the patio stairs.
As soon as he stopped, Ruben felt a crack in his back and was forced to bend over, catching himself just in time with his new front legs.
Now on all fours his chest barreled and his rear quickly grew bulkier. With the sound of tearing cloth, the diaper was ripped of as his horse cock appeared once more with a violent orgasm, expunging his last human semen from his body.
At last, Ruben felt his face push out as it shifted in to a horses muzzle, his equine member, throbbed once more for a second orgasm, as all the changes finally finished.
Where once stood a boy, there was now a young colt.