You licked your lips at your brother's towering horse cock between his legs, when suddenly the thought hit you: why not make it a real horse cock? You focused the thought of a horse penis on Tommy's member and the transformation began immediately.
First the size increase began, his dick doubling in length to nearly 30" long, and girth thicker than your bicep! His balls began to expand as well, growing from the size of apples to very plump grapefruits as they refilled with fresh stallion cum. Then the shape and color began to change, his shaft turning dark black with splotches of pink as the huge mushroom on top flattened and flared out. A thick sheath developed at his crotch as his engorged sack turned the same black color as his rod.
If Tommy's dick looked ridiculous on his small 10 year old body before, it was positively ludicrous now. He didn't seem to notice a thing about his transformation though, still grinning at you with anticipation while idly stroking his monster cock. "You wanna help? Or just stare at at my wiener all day?" he snickered.
"Oh, uh, sure! Yeah!" Satisfied with his new endowment for now you climbed into bed with Tommy, eager to see what that new tool could do. You placed yourself between his skinny legs with his equine shaft looming over you. The heat and manly stallion musk emanating from his cock and balls overwhelmed your senses, and you couldn't help but bury your face in his crotch. You ran your tongue over his hefty gonads as you huffed his sweaty aroma, making your way along his massive veiny tool until you reached the wide tip. You felt you could quickly get addicted to this dick.
"Oooh yeah, that's it Ben..." Tommy moaned as you slobbered on his cock. "Lick it all over..."
The more you tasted and stroked this pillar of man meat the more you felt a desire to go further with it. You planted a final kiss on Tommy's tip before repositioning yourself on your hands and knees facing away from him, spreading your asscheeks to present your hairy boyhole to him.
"I can't wait anymore Tommy, I need you inside me," you told him while looking back at him. He didn't need much more convincing than that, springing into action to line his cock up with your willing hole. As you felt the burning hot tip begin to press against your back entrance you suddenly remembered you may need to make some modifications to yourself to even survive this beast, which you promptly did (you hoped). As his gigantic fuckstick began to penetrate your virgin hole you didn't feel any pain, so you could only assume it worked.
"Mmmpphhh... You're so tight bro," Tommy moaned as inch after inch slid inside you, your hungry ass gobbling it all up with ease. Soon you felt his huge, heavy sack bump up against your comparatively tiny one, telling you he was all the way inside. His dick was so deep inside you you could swear you felt it in your throat. After that point Tommy was completely in control.
Your little brother grabbed you by the hips and started to pound away at your ass with a power and stamina you'd never seen from him before. Must have been all that horse testosterone those balls of his were pumping through his system. His huge nuts slammed against you with each thrust, his beastial baby maker rearranging your guts in ways that without your powers over reality probably wouldn't be healthy otherwise. The loud, sloppy SHLCK SCHLK SCHLK of his cock sliding in and out of your juicy asshole filled the room and likely leaked out into the halls as well. Within on a couple minutes his relentless assault had already forced two climaxes out of you.
"Mmmm, so good!" Tommy growled like a wild, lusting beast as he destroyed your bussy. Even after 20 minutes he was still going strong, while you on the other hand were turning into an orgasm overloaded mess. You could barely think straight from how good he was fucking you, your tongue hanging out with your face in the sheets as you came for the 5th time. It was a miracle there was any cum left in your balls by that point.
As Tommy increased his thrusting he bent over top of you and grabbed you by the shoulders to get even more leverage. Sweat and sex fluid poured off of both of you; this was the most intense sex you could've ever imagined, and it was coming from your 10 year old brother!
"Ben, I'm gonna cuuuuumm!!" Tommy suddenly cried, wrapping his arms around your middle and wrenching you backwards with incredible strength. The young boy lifted you completely off the bed, the majority of your weight held up by his incredibly powerful tool speared through your body. You felt the diamond hard fuck stick swell inside you as the first rocket of cum blasted out like a punch in the gut. It felt like his semen was being pumped directly into your stomach, a theory which the rapidly growing bulge in your belly supported.
Tommy just kept cumming and cumming, so much so that your body could no longer hold all of it! His shaft was too thick for it to spill out your ass, so it only had one other way to go. You felt his salty load bubbling up at the back of your throat, and before long gallons of excess tween sperm were gushing out of your mouth. You could've morphed yourself to stop it, but you actually found it extremely arousing to be filled to overflowing like this.
When you finally came to your senses you looked up to see Tommy smiling down at you, his dick having retreated into its sheath for now, leaving only his heavy testicles visible. "Thanks bro, I was super backed up. But I feel way better now!"
"Sure," you coughed, splooge still coming up as you tried to speak. "Anytime, Tommy." Despite how worn down you felt, you definitely weren't done being horny. What would you do next?
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