"Hey will you look at this one!" said Mark holding up a large sized toy looking like some victorian soldier mounted in the saddle of his valant black steed.
As Sei looked on Mark ripped the soldier off his horse and flung him into a far corner. Turning to face Sei he was about to toss the horse in yet another direction when it began to glow a pale yellow.
Frozen in a moment of terror Mark stood there holding the model of some hearty breed of war horse and stallion.
"Mark, drop it, drop it!" screamed Sei as his yelling brought the calls from the others veturing about that old and hunted mansion.
Mark stood there frozen of fear, standing stiff he could not make a slightest of moves. The black horse now glowed so bright its light filled the room.
First a shirt button popped off Mark's shirt, then two and three more. Sei could see the absolute horror in Mark's frozen eyes and facial expression. Yet as frozen he stood there his skin was rapidly turning dark in color. Mark's eye color changed from bright blue to darkened orbes of brown.
As Mark changed more and more to resemble the black stallion mount, the horse began to look like a statue of mark.
It was as his head and neck had changed so that if Sei had not known it to be Mark, he'd never have thought it was anything more than a horse's head on a half human boy.
Suddenly the black statue of a half horse and half boy fell from mark's fast changing hands. The two middle fingers darkened to jet black, merging they did to form his fore hoofs, as the other fingers melted away.
Now the new changing boy could move his eyes, then his lips and jaw. Scared as well as one might be in such a fix he tried to speak. try after failed try came out as shrill high pitched whinnies.
Shoulders changed making his froelegs more prominant as a horse's are and bringing the changes upon his chest and belly.
Popping sounds from Mark's back suggested massive growing of his spine and bones. It was with a jerk of his head feeling a sharp pain he and Sei both saw his jutting out of a soon to be horse's tail.
"I can't do a thing bud!" said Sei almost in tears.
Mark whinnied back as his legs and bones there in began to grow and shift.
"Damn it guy I never realized how big a pecker horses have!" said Sei as his usual perverted views were now on Mark's changing groin.
It wasn't long after that when the changes slowed and came to a final stop. Mark stood before Sei and the others a black stallion horse of some hearty large breed. A soldiers tall mount he was now and although still thinking like a human boy he was feeling the onslaught of instincts and the lusty desires of a verile male horse.