Wordlessly, the man looked down at her and smiled. His left hand quickly met her throat and put pressure on the collar while his right slid up her scalp and gathered her hair into a makeshift ponytail. Instinctively, Christie slowly fell to her knees and drew her eyes down to meet his still throbbing cock. She was shocked to see him remain completely hard after ravaging her so completely, but it didn't interrupt her at all. Within moments she wrapped her lips around his cock and lightly began to slide down his shaft, eliciting sudden jolts and spurts from him. To her surprise, she couldn't get it all the way in, so she brought her hand up to the base of his shaft and started stroking the remaining length.
"Now let's train your face to service me" the man cooed, while bringing his hand from Christie's collar to her wrist. He forcefully brought her free hand up to his balls, and she eagerly began stroking them. They were so heavy, so warm... she accelerated her pace at the thought of swallowing her master's huge load. "And be ready, my body has been enhanced for this."
Christie started to lose track of her thoughts... the pleasure, her submission, the sudden force of it all wore away at her ego, and she happily served her desired role. Her master's cock became her plaything, and she wanted to make him explode for her. She didn't miss a beat as she sucked his throbbing rod, feeling it swell ever larger, and worked his shaft and balls. She loved the feeling as they bounced off her face and hands as she serviced him. Any minute now she knew he'd cum and her role would be fulfilled. Her body would be changed further. She would be his perfect slutty slave.
"Now, swallow it all."
Eagerly, she pulled his cock in and held it. She suckled on it as he came, load after load, into her mouth, filling her with warmth. In moments, her whole face was warm, and her lips puffed out, enveloping his dick further. Her nose flattened subtly, and her eyes drew into a clean almond shape. As she realized her transformation was resuming, she began to cum, her entire body convulsing in waves, as each load traveled down her willing throat.
He gripped her ponytail tightly and pulled her face down over his cock. To Christie's amazement she took his full length this time, as her throat became overwhelmed with the warmth of her transformation. One final, powerful load of cum pumped into her as the man groaned in relief.
"Good girl. Took every last drop."
Christie moaned in relief and pleasure as he released her and pulled himself out. She sucked in several sharp breaths to recover, but kept breathing heavily. She felt her chest tighten and pull up as her breasts rhythmically rose and fell. They filled with warmth as they slowly stopped falling, tightening into smaller, rounder forms of themselves. As the warmth spread down her arms and stomach, she felt her skin tighten as her muscles firmed subtly. Within moments it was done, and Christie slowly regained control of her own mind.
"Th...ank you, master." was her natural response.