Holding his more equine than human member, Ruben stood baffled at what he saw.
"What is happening?" He asked out loud, just as realisation hit him. He was turning in to a centaur!
"The coins are real, they are really magical!" He shouted.
As he held his new horse cock, a sense of pleasure that Ruben has never felt before rushed down his spine. His new member was more sensitive than his previous one. Overcome with the pleasure Ruben started to stroke his new member, not noticing that a hairy, blondish, tassel was growing out of his spine, just above his but.
Huffing and puffing, Ruben reached his climax, as the last of his human semen exited his horse cock.
Now thinking clearly again, he felt a bit of weight hanging from his spine, and reached his arm around.
There he felt, a bunch of hair, growing out of the base of his spine. Turning his head around Ruben noticed the blonde horse tail growing out of him.
"This is so weird, yet so cool" he said, as his tail grew past his knees and ended just above the ground.
Before he could admire his new change, an even newer change started as an itching sensation spread around his legs. Brown horse fur was growing, covering his legs and hips.
His toenails darkened, and his toes merged together, turning in to hooves.
Ruben lost his balance as his knees reversed, and his butt started to swell. His butthole puckered up, and turned into a dark greyish tan.
Laying on the ground, he rubbed his new fur. It was smooth to the touch, just like a real horse.
He then felt his rear expand, as his butt and tail moved back more.
A second pair of horse legs started to appear, from his waist, hooves first.
His new appendages were long enough now, to try too stand back up again.
With the strangest senstation he has ever had, Ruben used his new horse legs to rise up from the ground.
His hair was starting to grow out a bit, whilst also turning lighter in colour.
He felt his human back itch, as a blonde horse mane, that matches his tail started to grow.
Ruben looked around and down. He was now an actual centaur!