Some "cocky" unicorn stallion tries to upstage pre-s1 Trixie and loses. As punishment, she enlarges his junk to the point of immobility.

“You thought you could outperform the Great and Powerful Trixie?” Trixie sneered down at the colt who she had tied up on the stage in front of her. She harrumphed. “Not much to look at, are you?”

“Not now that I’ve messed up, I guess.” The stallion chuckled sheepishly. “I guess I look pretty silly now, don’t I?” So he was a self-deprecating one, then? That would make this more fun.

“Not,” Trixie said smugly. “This will help, though.”

“What do you - whoa!” The stallion let out a yelp as Trixie’s horn began to glow blue at the same time as his crotch. His shout turned into a long, slow moan, though, as his stallionhood began to perk up between his legs.

“Mmff,” the stallion moaned. “Hng. Hng.”

“There we go,” Trixie said. The stallion’s member was fully erect by now, standing tall at a respectable foot in length. He was biting his lip, clearly trying to resist the pleasure of her magic’s stimulation. “That’s a start.”

“What…are you doing?” he grunted.

Trixie feigned surprise. “Isn’t it obvious?” she said. “I’m helping you steal the show!”

The stallion leaned back and groaned again as Trixie’s magic surged brighter. Soon, the audience had no trouble seeing what was going on. Impossibly, but irrefutably, the stallion’s shaft was starting to grow in size, inch by inch.

It twitched beneath the touch of Trixie’s magic, reaching fourteen inches and passing eighteen soon after. The stallion panted and panted, his hips squirming as his cock reached a full two feet in length. It was clear by now that his arousal was driving him wild, but as he leaned forward, his mouth opening to take his now easily-reachable shaft into his mouth, a bright blue barrier erupted between his open muzzle and his dripping, throbbing shaft.

“Uh-oh,” Trixie sang out as the audience gasped. “Can’t have you getting release before Trixie allows it. Let’s see how big we can get you, first.”

The stallion’s eyes nearly rolled back in his head as his stallionhood swelled and throbbed. A thick bulge emerged from the base, starting to move up toward the medial ring - and then stopped in place. Trixie grinned as her magic pushed the stallion’s orgasm right back down, denying him even the smallest of orgasms.

“Bigger,” she chanted. His cock was now three feet long - now, three and a half, a monstrous meaty python that stretched above his horn when fully erect. “Bigger,” she said again, and the stallion’s hips thrust madly forward as his cock more than doubled his height sitting down.

“Bigger,” she said a third time, and the stallion collapsed to the floor of the stage, pinned underneath the weight of his own package. Massive, cum-filled bulls churned between his legs, pushing them as far apart as they could possibly go. His cock, nearing eight feet tall by this point, was even wider across than he was, and almost certainly over twice his weight. He grunted; he groaned; he thrashed; he moaned. And then -

“Big enough?” Trixie asked, putting on her most innocent voice. Each pony in the audience watched closely as the enormous horsecock pulsed, twitched, and then stood perfectly still -

She couldn’t keep the massive, shit-eating grin off her face any longer. “Then by all means - let it all come out.”

Her magic winked out.