Rex blushed. "Well, it's probably kind of weird, but..."
"Yes?" Ty asked, as he stroked Rex' cheek gently.
"I'd wish for a cock to match my body!" Rex replied at last, laughing after he said it.
Ty giggled, surprised, and very turned on. "Really? You want it to be as big as the rest of you?"
Rex blushed. "Well, I'm kind of used to being so big... I can't imagine being small... and my cock... it's normal... but I'm not... and..."
Ty put a finger to Rex' lips, silencing him. "It's okay," he breathed, "I understand... And... I like it..." Ty grinned, and then let his finger travel down Rex' face, down his thick neck, down over his bloated pecs, down his rock-hard abs, all the way down to big Rex' average dick. And as Ty ran his fingers over it, the member began to swell. Getting harder. But also larger overall, lengthening and thickening, growing to match the huge body it was attached to.
"Oh, oh fuck!" Rex exclaimed, throwing his head back, pleasure shooting through him. He groaned as Ty's fingers worked their magic, and his cock grew. Eight inches. Ten. Eleven. Twelve. The big head thickening and flaring, pre leaking from it copiously. Thirteen. Deep groans erupting from Rex' thick throat, one after the other. Fourteen. The growth of his cock finally subsiding, while its hardness only seemed to increase, the big shaft pulsing eagerly, the veins that wreathed it seeming to move on their own almost.
"What the fuck..." Rex began, but his words died as Ty's lips touched his cockhead, planting a soft but sensual kiss. Which was soon followed by a long, agonizing lick, as Ty began to clean Rex' cock, lapping up the pre that had leaked out. He could feel the big man bucking beneath him, his body wracked by spasms of lust. Ty grinned, and redoubled his efforts, using his tongue to explore all fourteen inches of Rex' fuckpole, lapping at the big, ripe balls, then returning to suck on the fleshy mushroom head, eliciting groans of delight from the big man. Then Ty opened his mouth as wide as he could, and forced himself down onto the big cockhead. It went in with difficulty, but he managed. Rex howled with pleasure, his hips bucking upwards, driving his dick further into Ty's mouth.
Ty panicked momentarily, as fourteen inches of hard, thick cock were jammed in his throat. Then he used his power to modify himself, just a bit. Rex let out a low groan, as he felt Ty's throat take more of his cock, slowly, so tight, yet able to take more, until Ty's face was buried in Rex' bushy pubes. "Oh fuck!" Rex wheezed, bucking his powerful hips, shoving his dick into Ty's face. "THAT'S FUCKING INCREDIBLE!!!" he roared, feeling his cum build up in his balls, ready to shoot. He put his hands on Ty's head, holding the smaller man's head in place as he pounded his dick up into Ty's throat, growling with lust. Ty sucked hard, working to keep Rex' big tool in place, eager to give his big lover as much pleasure as he could. It worked magnificently. Rex pumped his huge new tool in eagerly, thrusting it with his considerable strength. He let out one howl of pleasure after the other, leading to a roar of ecstasy, as he unleashed his load down Ty's hungry throat. The smaller man sucked it down eagerly, loving the sensation of the big, hard dick spasming inside his throat, loving the rush of thick, creamy cum going down it.
When Rex was finally finished, Ty pulled off, slowly. "So," he asked with a grin, "How do you like your new cock?"
Rex lay back, a huge grin on his face, and sighed happily. "I don't know what I love more - the cock, or incredible bj that came with it!"