Nel looked over the worksheet on his desk with disdain. He could already see what it would be like once their allotted time to complete it was up and he turned it in. It’d come back with checkmarks next to every single answer, a 100% grading following by an A+ or an A++ if the teacher was feeling particularly cheeky that day.  He sighed and looked around at the other cubs still working diligently, nervously glancing up at the clock and then hurriedly casting their eyes back down onto their worksheets. There was one boy who looked particularly stressed out… a young horse colt. He was wearing a football jersey of some team Nel didn’t recognize and a pair of athletic shorts. His fur looked damp with sweat, Nel remembered that the period beforehand had been P.E., so it made sense… but most of the other cubs showered off before coming back to class. His lips curled into a sinister smile and he relaxed himself, keeping his eyes locked up front to see the teacher still had their head buried in a newspaper. 
	His tail began to shift colors, slowly taking on the colors of his surroundings until it was practically invisible. A Chameleon’s natural traits could accomplish this alone, but Nel was also exceptionally smart, so it blended in seamlessly. The invisible snaked from his seat across to the colt’s leg, sliding carefully into the baggy, shiny shorts he wore. Nel could feel the heat radiating from the horse’s underwear, he’d worked himself quite hard, his only regret was that he couldn’t reach down with his face and huff the boy’s scent. For now, he’d have to settle with getting his tail around some horse cock. His tail slithered into the colt’s underwear easily, the cool scales instantly starting to grow warm as it wrapped around the surprisingly thick horse shaft. He knew horses were well endowed but to be this thick at their age… Nel’s dick was maybe 1/3 of the thickness.
	Finally, his target showed some sort of reaction. He could feel the blood rushing to the colt’s length as his sheath retreated and the equine’s dick began to drop from it. He looked around the room, casting a quick glance towards Nel as if accusing him of the sudden reaction in his pants, but Nel had already pulled a book out to silently read as instructed by the teacher. The colt returned to the test at first, simply shifting the position of his cock so it didn’t poke out of his underwear before his pencil began to move again. Nel grinned again and his tail squeezed the horse’s length, eliciting a surprised flare of the horse’s nostrils as he exhaled through them in reluctant pleasure. He was so confused, he had no idea what was happening and he was only getting harder. Nel’s eyes were glued to his crotch, watching as the “chaste” outline of the horse’s flaccid sheath in the colt’s shorts began to grow into a far more defined tent. 

	Now that he had a few inches to work with, Nel’s tail began to pump along the slowly erecting length, teasing just under the horse’s flare each time as he watched the poor colt writhe in his seat. His fingers gripped the edge of his desk as Nel watched on in amusement, pretending to be totally absorbed by his book each time he looked around the room for an explanation. He’d find none, besides the far easier to hide tent that Nel was starting to sport as the intense heat settled into his scales and warmed them to the touch. His endothermic biology began to work in his favor; his once cold scales were now just as hot as the horse’s dick, which he could tell from the gasping, barely hushed grunts that it felt heavenly. 
	The urge to reach into his own pants and start stroking himself off was hard to resist, but he couldn’t give himself away. Besides he wasn’t trying to embarrass himself today, only the poor colt who happened to be around while he was bored. He kept pumping his tail, stroking the colt’s pulsing equine length with smooth, warm scales as he snapped the tip of his pencil which gave him an excuse to groan out loud into the otherwise dead silent room. If you listened closely, you could hear the quiet, slick sounds of pre-cum being smeared into the horse’s length as it pulsed and throbbed in the grip of Nel’s tail. He knew the colt’s boxers were a mess without even looking at him. 
	It wasn’t until he heard someone in the back row gasp that he dared to look again. The colt’s length was too much to be contained in his underwear; the flared head was spilling out the pant leg of his shorts, exposing the boy’s endowment to the entire classroom. Nel had to finish him off fast to be able to enjoy the show, so he quickened his pace as the entire back row had to watch as the horse boy’s dick pulsed and jumped and throbbed, spraying watery pre-cum all over the floor beneath his desk before finally, the entire class heard a whinny and turned just in time to see the explosion. The horse boy couldn’t hold himself back anymore and came hard, spraying watery jizz onto the floor, the underside of his desk, all over his shorts… Nel could feel every last pulse and twitch of the boy’s member; his own boxers grew a bit sticky as the sensations rocked through his tail. When he was finally finished, Nel quickly withdrew his tail and returned it to his normal color of purple before he joined his class in gawking at the poor colt. The commotion was finally enough to get the teacher to lift his head up and he just gasped and immediately sent the horse to the infirmary to get a change of clothes and explain what had happened. The whole class began muttering amongst themselves besides Nel who read his book with a knowing grin as they talked about the colt… the latest in a long line of unexplained spontaneous orgasms plaguing the fifth grade class. Unaware the culprit was sitting right there in plain sight.