Rick let his momentary regret pass and decided he was too far in to stop now. He stood back as Brendon looked away in anguish, knowing his humanity was certain to vanish in moments. The teen began to slip further into his dinosaurian transformation, crackling madly as bone and muscle began to shift.
Rick watched as the boy’s shortish muzzle began to lengthen, his tail stretched, and his claws and jaws began to grow ferocious. Brendon opened his growing mouth to let out a heartbreaking whine as his voice began to fade and Rick could see his teeth growing thick, curved, and serrated.
A few moments more, and the teen’s spine and hips began to realign. His posture began to lose all human form as his rib cage expanded and his torso lost width. His shoulders shrank, his arms began to pull in, and his fingers began to merge to number three. Meanwhile, his three toes grew larger on his theropod feet and his ankles began to tremble and snap as his heels rose.
The increasingly dinosaur to be sat in the wafting mist and trembled in terror as the changes washed over him. He knew he could do nothing to fight the transformation and he could feel his own human body seeping away from him. There was nothing to do but sit, tears still falling from his eyes, and wait for it all to be over.
Rick, meanwhile, watched in overjoyed fascination as Brendon began to compact, grow lean, and shrink to his final configuration. His feathers were now growing in around his shrinking arms and his expanding hips. As his legs cracked into their distinctive dinosaurian angles more wisps began to grow down his side and hips. The creature groaned mournfully, fresh misery taking him as he began to slim down and lose the last of his human features. He was nearly done. His face had stretched into long elegant jaws. His ears had diminished to open membranes behind his eye ridges. Even his dangling cock had gone, pulled into a sheath under the base of his tail.
Brendon opened his eyes, still sobbing through the mist, and huffed a pained and pleading look of desperation at Rick. The inflection was clear: please have mercy on me.
Rick watched the gaze of his former step son as he began to enter the last stage of transformation, now a complete five foot tall deinonychus in body but not yet in mind.