"Let's work on the big part first." Tobias grinned. "That will give you something to play with while I do the rest." He reached down and started to rub Mika's already impressive equipment. "Think of the stallion, what was between his hind legs."
Mika shifted in the straw, getting hard as Tobias massaged his penis. The stallion's cock was thick and black and nestled in a heavy sheath, with testicles the size of tangerines hanging below in a black sack. As he pictured it, he felt his own shaft thicken, and pressure build. It was a curious sensation, but a nice one. Tobias glanced down and chuckled, then shifted to allow Mika to get his own hands down to the transforming shaft. "That's the kind of big I meant."
Mika gasped as he felt the immense shaft in his hands. The sensations were intense, and it was easy to forget everything else as he masturbated the swelling equipment. Tobias was kissing and stroking his face, sliding fingers into his nostrils, his ears, pressing against his forehead, pulling at his brows. and ears. It felt odd, but he could not tear his atentin from his massive genitals.
Tobias felt the magic that had shaped Mika, and began to remold the boy's features as if his skin and bones were soft clay. Mika was not handsome, more average for a peasant boy. Tobias changed that. Nostrils enlarged, the nose flattened, the lower face began to protrude out. Ears stuck out and got bigger, and a heavy brow formed over large, wide-set eyes. Teeth got bigger, the chin harsher. As Mika grunted in pleasure as he masturbated himself, Tobias admired his sculpting. Mika was truly ugly now, looking rather donkeyish except for the high forehead.
Mika was rocking as he thrust into his hands, the massive black horse's cock grossly oversized for his boy's body. When he dropped to take a piss, Mika would probably come close to dragging the ground.
Tobias watched Mika's eyes closely. They were still bright with intelligence, though the sexual pleasure was obviously overwhelming thought. He waited until the equine testicles began to swell prior to release, and placed his hands on Mika's forehead. The orgasm would supercharge his own magic, giving him the ability to do what the stone had not managed on its own. Mika grunted and gasped, and then arched his back as he started to orgasm. At the same moment, Tobias pushed down on Mika's forehead with both palms and felt the skull deflate like a leaking waterskin. He felt the hard jets of semen between them, and then gasped. A blast heat enveloped Tobias as Mika grabbed him in a hard embrace, thrusting against Tobias' crotch as he emptied himself.
When the sensations faded, Tobias opened his eyes and found himself staring into the liquid brown eyes of a jackass. They were Mika's eyes, set in the ugly, bestial face he had created. The boy gazed up at him blankly at first, then gave him a goofy open-mouthed grin. "Hi."
Tobias sat up, actually astride the full-sized sheath. Looking down, he saw not only the stallion's cock he expected, but another alongside it. Blinking, he realized that there were two full-sized horse's sheaths, cocks, and testicles, Mika's and his. In fact, he didn't see any difference at all between the filthy freakish boy's body he was sitting on and what he could see of his own.
Mika raised a coarse, calloused hand to stroke Tobias' jutting jaw and wide nostrils. The transformed boy started to piss as his cock drew back, and Tobias felt his own bladder drain at the same time. He could not stop himself. Standing, Tobias had to shift to accommodate the flopping penis that hung like another arm from his crotch and the swollen testicles. He made his way to a water bucket and stared at his reflection. It was Mika's reflection - he had become an identical twin to the ugly, horse-hung boy who was awkwardly rising from the straw. The magic had rebounded to transform Tobias as well! However, even though he had the same flattened skull, his mind seemed intact. Mika came up behind him and embraced him, the equine sheath and receding cock teasing Tobias' butt. The contact made him shudder, not only in pleasure, but because he felt his mind empty.
Mika blinked as Tobias sagged slightly, and then gasped in amazement as his intelligence returned. The other boy turned to face him, eyes vacant and mouth slack, displaying the grin of an imbecile. He hugged Mika and their crotches pressed hard and sticky against each other. Awareness flickered back and forth, but when Mika pulled away, it was still Tobias who stared blankly, then shuffled off to pick up fresh manure in his arms and carry out to the manure pile. Mika grinned. They were identical twins except for the intelligence that now swapped back and forth. Intimate contact let that intelligence move back and forth, leaving one normal and one a moron.
He followed Tobias, catching him easily and turning him around to embrace him. The fresh manure squished against their chests, and as he pressed his crotch against Tobias' Mika's mind emptied and Tobias jerked back in sudden awareness. The dull Mika picked up the fallen manure and shuffled out back while Tobias grinned after him. This was going to be interesting.