He looked at the two jocks for a moment, and then thought impishly, 'Let's make them think I've finished with them.'
"Okay, guys," he said casually. "You can put your boxers back on." They immediately rushed to pick them up. "But ONLY your boxers," Todd stressed, waving his wand emphatically as he watched them pull them on, still sporting raging hard-ons.
"Now turn round so I can see your butts," he instructed.
Puzzled, the two young men did as he said, their hands cupping their groins. One guy's shorts were blue, the other's white - but at a flick of Todd's wand the blue pair turned white too, causing the class to gasp in admiration. And when he waved the wand a second time, both pairs of boxers became gym shorts, which hugged their bubble butts delightfully.
"Appropriate, don't you think?" he said to his classmates, "since the two of them are jocks." There was a burst of appreciative laughter. "Sexy too..." Todd eyed the guys' asses thoughtfully. "But d'you know what would be even more sexy?" He paused and smirked. "Tails..."
"Tails?!!" the jocks exclaimed, horrified.
"Long ones..." Todd moved closer as he spoke. "They'll look great on those big round butts of yours." He laughed as he saw their expressions. "So go on..." He pointed his wand at their backsides. "Do it! Sprout long sexy tails through your shorts."
"No freakin' way!" they protested - but as Todd's new spell engulfed them they both suddenly moaned, reaching back to clutch their butts with both hands.
"That's it," Todd said appreciatively. "Put on a show for us... Enjoy it!"
The guys moaned again, rubbing the cheeks of their asses, and then bent forward so their butts stuck outwards prominently.
"No!" said the one on the right desperately. "I don't want to grow a tail!"
But there was nothing he could do about it. Even as he said the word "tail" a bump sprang up in the seat of his white shorts, pressing against the cloth.
"Ohhhh!" he gasped, peering backwards - and beside him the other guy gasped too, clapping a hand to the top of his ass crack where a similar bump was forming.
"Oh shit!" he exclaimed, squeezing it. "SHIT!!!!"
Writhing and moaning, they wagged their big asses from side to side as the bumps pulsated and grew bigger. Todd could see the mounds of their balls between their thick thighs as the lads bent more steeply, the bumps in their shorts now bulges.
"My shorts are so tight!" gasped one, gripping his knees. "So tight, man!"
"So are mine," said his buddy, his face flushed and sweaty. "It feels like a freakin' hard-on!"
Todd grinned from ear to ear. It looked like a hard-on too - obscenely thick and rigid. He really wanted to touch it.
The two handsome studs thrust back with their butts, encouraging their tails to keep growing. It was so hot to watch, not least because the act of sprouting tails had caused the fronts of their shorts to bulge. The guys were as hard as rocks!
"Auughhhhh!" they both groaned, looking back at their butts as their tails pushed out to six inches. Sweat beaded their muscles; their hair was damp with exertion. And still their shorts didn't rip.
"Keep on bending," Todd said, waving his wand. "I'm going to do something."
Adjusting his own rapidly stiffening cock, he moved to stand behind the two jocks, stuffing the wand in his back pocket. Then, reaching down, he took hold of their shorts-covered tails as if gripping the handles of a wheelbarrow.
"Oh yes!" he gasped as he gave each a good squeeze. "Awesome!"
The guys cried out in ecstasy, arching their backs, and Todd nearly came in his pants. It was so incredibly erotic - but still he held on to their tails, squeezing and rubbing them with his thumbs as the jocks continued to bend over. He could feel the tails growing in his grasp... sinuous and strong... pulsating with pants-stretching power...
"Push," he instructed, letting go of their tails, "..push against your shorts real hard!"
The jocks dutifully obliged - no need to cast a spell this time - grunting and moaning loudly as they forced their growing tails against their shorts. One guy dropped into a squat, rubbing his engorged cock shamelessly as the seat of his white shorts grew tighter and tighter, while the other fell on all fours, thrusting his bulging ass as high as it would go.
"My tail's so long..." he groaned, reaching between his thighs for his own cock. "I can feel every inch of it!"
"Yeah!" gasped his buddy, panting and straining. "'S'gonna rip through - ugh! - my fuckin' - ugh! - shorts!"
They frotted their cocks furiously, their moans growing even louder, as their shorts reached the apex of tightness.
"Awwww, I'm gonna cum!"
"Me too!!!"
And as they both unloaded in their shorts their pent-up tails burst out with the force of bullets - long and lithe, lashing and writhing - sprouting to a metre in length.
"Oh yeah!!!!" yelled Todd as he, too, copiously creamed his pants. "Jocks with tails!!! FANTASTIC!!!!!!"