Cole kneeled in front of Sam and stayed quiet for a second. He was a little hurt in his pride that Sam was so quick to disregard his manliness, but at the same time there was something appealing to the situation that he couldn't explain yet; so he was willing to compromise.
After a moment of hesitation, he pulled his shirt over his head and discarded it, his "moobs" jiggling slightly as he did. They had swollen exponentionally in the last 24 hours, and looked decidedly more feminine now.
"Fuck man, are you a tra..aah!" Sam moaned as Cole leaned forward and put his friend's dick in his mouth.
Although Cole had a second of anxiety - after all, it was his first time doing this - it quickly washed away as Sam's erection became extremely hard, which Cole took it as a sign he was getting it right. Sam leaned back and let Cole in control, his heavy breathing echoing the otherwise desert changing rooms.
As Cole increased the pace, wrapping his mouth as sensually as he could around his friend's cock, he could feel his small boobs bouncing in rythm. Soon enough he realized either that or his friend's dick was turning him on, and he was growing a massive hard-on along his leg, which was threatening to poke out of his short's leg hole. Covering that with his hand sent a shiver down his spine and only excited him more, causing a load of pre to gush against his thigh and in his hand.
"A.. are you touching yourself now?" Sam asked, blushing. His dick throbbed harder in Cole's mouth, leaking a salty substance over his tongue and the back of his throat. Cole knew his friend was close.
Wrapping a free hand around Sam's dick, Cole increased the pace again, sucking on his friend's cock while stroking his own massive member through his shorts. Soon the bulge started taking on a more canine appearance, with a large bump for a knot, and his glans getting pointier as it poked out of the leg hole. Fortunately, the angle was not good enough for Sam to pay attention - not only that, but Sam was starting to be so enraptured in his own head that he would moan audibly.
That fact made Cole harden more and cum, with several heavy ropes of thick canine semen splattering under the bench Sam was sitting on. An extremely feminine moan escaped Cole's throat as he kept on sucking on Sam as best he could; this was all it took for Sam to climax, filling Cole's mouth in thick, warm goo as Cole was doing the best he could to keep his hips for bucking and drawing any attention to his mutant member.
By the time Sam was coming back to his senses though, Cole was already soft enough to look unconspicuous, and was already putting back his shirt on, trying to hide his curves the best he could. His still hard nipples were poking through the fabric visibly though.
"Alright..." Sam said after clearing his throat, while Cole wiped his own mouth "don't mention this to anyone else, and I also won't tell people your pretty much got real boobs".
"Sure, whatever" Cole shrugged. If Sam talked, this would assure mutual destruction anyway, because people would certainly ask details about the circumstances around seeing Cole almost naked - and then everybody at school would get suspicious about Sam.