Mike woke suddenly, startled by a mix of strange dreams and curious sensations. He'd been dreaming of mounting he big mare back in the wizard's stable, and felt... "Hey!" He twisted around to find Brian probing inside of his sheath with his fingers, digging out soft small lumps from deep within the fold of flesh. It did not hurt, it just felt very odd, and a little arousing. His equine cock dangled halfway to the ground, not erect but well on the way.
Brian looked up with a grin on his stable-boy's face. "Getting your sheath cleaned out. Stuff builds up inside, old skin, dried semen, sweat and stuff." He held out his hand to show blackened fingers and dark uneven beads. "You seem to be enjoying it." He grinned as Mike's shaft continued to swell. "If we were back at the stables I could get you a mare or two."
Mike grunted, remembering the scent and sight of the massive mares in the wizard's stable. "Wish we were back there. I feel like my balls are gonna explode!"
"Just a short ride away." Brian reached behind the black cave of Mike's sheath and rubbed the swollen black sack that held the centaur's testicles. While it was not really going to explode, Brian had supercharged the ballsack so that it was taught with seed, and semen dribbled constantly for the flared cock. He felt Mike shudder, and saw semen spurt once. If he could get the centaur back to the stables, he could... Brian shook his head and frowned. Do what? Turn Mike back into a stallion? That was the stable boy mindset again. "Sorry. I shouldn't have gotten you horny."
Mike looked up to where Christine and Joe slept. "You know, we could go there and be back well before dawn. A willing mare or two would be nice."
Brian started to agree, but fought back the urges of the stable boy. "Mount those mares and you could end up a horse. We should stay here."
"I think the wizard has to be there for that to work." Mike grinned. "Tell you what. Help me with the mares, and you can work on me while we go there and back."
"But that would make you a horse, too!" Brian was alarmed, because he really wanted to finish.
"Not all the way. It takes you a lot longer to make changes. And I like what you have done so far." Mike extended a hand to pull Brian up on his back. "What do you say?"
Brian lost the battle with the stable boy mind and took the hand. If Mike was willing and knew the risks, they both might as well enjoy themselves. He settled onto the centaur's back as Mike carefully slipped away from the camp and made his way back to Lavenguard.