Rose spies Fred sneaking a peek

Fred moved his gaze to Rose's impressive body and his brain raced to a plan... if I focus on her I can transform to a muscle-hulk-futa and escape this place with sheer strength.

As her cock pressed against Fred's bottom, Rose's mind began to focus at the single task at hand, orgasming as hard and as often as she could. But, she still had some semblance of the moment at hand and noticed Fred alter his gaze toward her, and saw his biceps begin to swell.

"Oh, no you don't... sneaky little man."

In one swift motion she reached across the bed and slammed his head back with one massive arm, while strapping it in place with her other.

Confined to staring at images of vaginas and breasts... as well as the feedback of the cameras on his own body, Fred slipped into a haze.

He saw his cock and balls shrivel up and breasts bulge from his heaving chest. Hair lengthed and his features softened to become, in the end, some combination of all the images on the monitors. A beautiful well endowed woman.

Staring at her crotch, Fred was amazed to watch his labia form and descend, encasing Rose's glans. But it didn't stop there... the lips continued to grown until they reached the base of the massive shaft. Fred's pelvis audibly cracked and widened to allow Rose to push deep into Fred's bowels.

Rose grunted and came as Fred's massive folds flowed back and forth along her length. Cum splashed down on the floor. Again and again in rapid succession, until Rose's body shrunk back down to its passably mortal muscular form.

"Ahh, that is much better. I need constant orgasm to keep the hulk at bay."

She swung a keyboard on an extendable arm to her standing position and began to type hurriedly. IVs pulled blood from her body and Fred's, feeding them into automated centerfuges and DNA sequencing machines.

"Soon we will know your strain, and lock it down for the future of humanity. After trying it on me, first, of course. "