Devon changes first

Adam was in a world of total pleasure. Devon was a natural: born to suck cock, so heavenly was the sensation of the walls of his throat gripping Adam's shaft and the feel of his tongue swirling around the throbbing cock-head. The pre-cum leaking out and melting into the lining of his throat had turned it into a perfect cocksleeve: just the right amount of challenge for Devon to take it, and the perfect level of tightness and warmth for Adam. While he worshipped Adam's shaft he tore off his shirt and pulled down his gym shorts to reveal his own pulsing cock and had begun to jerk it off when he felt Adam's cock start to quiver and the speed of his thrusts slow into fewer but more forceful slams. He knew he was close, and he was so ready to swallow all the cum Adam gave him; there was no way he was sharing it with Clark, who was still engrossed in making out with Adam, as if to thank him for welcoming the two of them into this world of sexual supremacy.

'Fuck, don't you dare stop now you amazing fucking cocksucker,' Adam commanded down to Devon, placing both hands on the back of his head, and moaning into Clark's mouth as he felt the best orgasm yet building and working its way to the opening of his vast shaft.

'God, I want to see you give it to him, make him yours forever,' Clark whimpered. He clamped his lips on Adam's just at the moment that Adam finally let rip with an immense torrent of cum down Devon's gullet. He pulled out and slammed back down with every rope of cum that he fired from his immense cock. After about ten slams he let go and left Devon to try and contain as much as he could, but his stomach was bulging with all the delicious juices and eventually his head was fired off of Adam's manhood. He fell back in a state of total bliss, and watched with pride as the last few shots of cum landed on his chest and began to soak into his muscular torso. He thought the contrast with the white ropes of cum on his adonis of a black figure was just the most perfect thing he had ever seen, and looked down longingly and totally enamoured with the sight of Adam's thick fat cock coming to rest on his thighs, just below his own aching hard-on.

He didn't have long to enjoy the moment, however, before he felt an intense burning inside of him that seemed to emanate from the very core of his being but which he could feel very deliberately working its way towards his pelvis and the base of his turgid black cock. He arched his back in ecstasy and embraced the sensation completely. It was so overpowering he had little choice, and as Adam's Growth-X cum coursed through him he knew exactly what was going to happen. He threw his head back in delight: he was one with Adam now, a glorious, muscular, male sex god. Clark and Adam looked on in awe as Devon's cock began to grow. And grow. And grow...