The grooming continued, with the boy cleaning Mike's hooves and brushing out his mane and tail. Then he got a fresh bucket of water and moved by Mike's hindquarters. "I never asked before, but I guess you're a special case. I need to check your sheath for smegma. We have to do it on all our male horses. I figure you can't reach there yourself."
When Mike gave him a confused look, the boy grinned. "Maybe centaurs don't clean there, but it's a lot better for you. And it can prevent irritation. You don't want a sore cock, especially when it's that big!"
As strange as the request was, Mike realized that he not only did not mind, but looked forward to the intimate contact. "Oh, sure! Go ahead."
The boy started massaging Mike's sheath, loosening the flesh, and then slipped his fingers inside to gently probe. He kept dipping his hands in the water to lubricate them, and Mike felt small soft lumps being pulled free. The boy nodded to himself as he cleaned a dark residue from his fingertips. "Yeah, you really needed this."
Mike felt himself stiffening, and was mildly embarrassed. However, the growing erection appeared to make the boy's work easier. By the time the massive shaft was arced and stiff, it was also completely clean.
"Good fellah." The boy spoke to him absently, as if to an animal. Mike did not mind at all, no longer concerned about modesty at all. But he still was surprised when the boy's damp hands rubbed the sensitive tip of his shaft.
The boy grinned up at him as he gently masturbated the broad, flat glans. "I know our normal stallions like this. Without a mare around, you don't get much chance for release."
The sense of pleasure was amazing, not as strong as when he had been with the mare, but still intense. As the boy continued, Mike felt his testicles pull and swell. Part of him was confused at the ease he accepted such handling, but mostly he was lost in growing orgasm. His hide quivered, and sweat ran down his body. He started thrusting with the boy's caress, muscles tense and heart pounding.
"Gotta be careful, especially the first few times." The boy was slowing his stroking as Mike build to climax. "Liam said you could lose too much intelligence if we do this more than once or twice before the adjustment spell wears off. And I don't want to find out what your cum will do to me if I get it on me."
The boy must have felt the surge of semen start, for he stepped far back just as Mike's immense shaft shot a thick jet of heavy whitish fluid that splattered against the straw and wall. The semen was lumpy, and gave off a strong odor of musk that Mike found pleasant. He shuddered again as a second ejaculation sprayed out, and stayed rigid for a few more seconds until the sexual instincts finally faded.
"Come on, fellah." The boy gestured for him to leave the stall, and led Mike into the one next to it. "I should have waited to groom you afterwards, but it's just messed up the back of your forelegs."
As the boy retrieved his grooming kit and the bucket, Mike was vaguely surprised by his easy acceptance of the experience. Being masturbated by a kid would have horrified him back home as a human. But this all felt right. There was no shame, for there was nothing to be ashamed of. Human morals no longer applied. That troubled him a little, but he could not quite think why.
The boy provided the answer as he returned and began cleaning the spunk from Mike's forelegs and feathering. "Does it feel any different?" At Mike's questioning look,, the boy continued. "Liam said all this would change your..." he frowned. "I guess the best word is core. Your core, your soul, whatever. Anyway, all this is supposed to change your core to that of a real horse. So that animal magic we need, like healing and control spells, all work on you. It's supposed to make you happier, too. But does it feel different from being a centaur? I always wondered about the fully transformed animals, but I couldn't ask them." He grinned and used his hands to clean the tip of Mike's retracting shaft. "Sometimes I even think it might be fun myself."
Mike blinked in surprise, both at the idea of having something so basic changed, and at the boy's own admission of interest. If he really thought about it, he knew that most of what had gone on would have embarrassed him at least. But he had to struggle to think why. Human morals and taboos seemed pointless and silly. Then again, they did not apply to him at all. He would be regarded as an animal, and expected to act and react as one.
"It is different I guess, but not in a bad way." Mike smiled, feeling the truth being his admission. "I think I like it better, having no inhibitions. But it's really hard to imagine anything like that ever applying to me now. I mean, I know I used to think being naked was bad, and pissing in public was horrible. But now I know it's all just normal."
That earned Mike an affectionate hug around his waist. The boy grinned up at him. "I am so glad we got you! You're the only one who will be honest with me and who can talk to me."
Mike hefted the boy up easily and gave him a hug in return. This startled the boy at first, but he smiled and threw his arms around Mike's neck. After a moment, he leaned back and looked Mike squarely in the eyes. "I want to know something really important."