Spreading his knees wider, Kirk pushed back with his butt, when suddenly the kid spoke again.
"You're not wearing boxers, are you?" The words came out huskily. "Not even a jock?"
"Nope. Went commando today." Which his cock promptly acknowledged by bobbing hard inside his shorts.
"Cool. Wish I had... My balls are sweatin' buckets, man!"
"What are you wearing? Briefs? Boxer-briefs?"
"Boxer-briefs, and with these tight shorts..."
Glancing up, Kirk saw the kid pulling at the crotch of his khaki shorts, which were a bit on the tight side. He also noticed, though the kid didn't seem to have, that his ears had grown an inch or two longer and were now decidedly hairy. 'Uh-huh,' he thought to himself, 'someone else is going donkey here...'
It was at that point that he realized that, though he still had his erection, his tail nub had subsided somewhat. In fact, it appeared to have tucked back into his butt crack. 'Uh-oh,' he thought. 'Gotta concentrate here....or get some help with it.'
Glancing upwards again, he tried to work out how old the kid was. Although he had a nice, solid-looking build (actually, he looked a bit more built than he had to start with; maybe that's why his shorts had got so tight), his cute-looking face didn't betray a readily-identifiable age. He could be anything from 14 to 18.
Sitting back on his heels to relieve the cramp in his back, oblivious of the tent between his thighs, Kirk put the question to him. "Hey, how old are you, kid?"
The lad grimaced. "17, but I know I don't look it. It pisses me off that I look so young." He scowled again. "I'm gonna be carrying an ID card around till I'm 30!"
Kirk laughed. "I don't think so somehow. I reckon by the time you're finished, an ID card'll be the least of your worries."
"Whaddya mean?" The lad stared at him, frowning.
"Well, in case you haven't noticed it, this place, well, changes you... I mean, how did you think I was going to sprout a tail?"
The lad looked bewildered for a moment, and then stammered, "I dunno. I didn't think about it." His eyes travelled to Kirk's butt, hugged by his snow-white rugby shorts. "So.. ARE you?"
"Am I what?" Kirk looked at him quizzically. It was cruel, but he was enjoying feigning ignorance.
"Gonna sprout one... A tail?" As he spoke the word 'tail' a powerful shudder ran through his body, as if the word was some kind of trigger. And it didn't just affect him; Kirk, too, was now awash with sensation, emanating from the cleft of his butt, and growing stronger by the second.
"Oh yeah," the young rugby player gasped, "you bet!" And glancing upwards, he added pointedly, "And so are you... so you'd best get ready."
Moaning and rubbing his butt, the lad dropped to his knees beside Kirk, and then braced himself on his hands, as Kirk had done to start with.
"A tail," he murmured again, with the same convulsive shiver, "I'm gonna sprout me a TAIL..."
Kirk shivered too, hearing the word repeated, this time with emphasis. His buttocks tingled and pulsed, his cock throbbed hard in his shorts, and slowly his ass crack started to widen, making room for what was to come.