Optimal maleness

The metallic arms whirred again, carrying Dwayne away from the lab and the scene of his shame. Brilliant colors flashed by, leaving him disoriented and confused. 

Then he was standing in a circular chamber, pitch dark except for a single circle of light on the floor...which he was immediately dropped in. Before he could do more than gasp, a **** field sprang up, confining him.

There was a hum. ACCESSING MEMORIES. A moment later the sensation of something crawling about the inside of his head.

QUERY...DETERMINE OPTIMAL STATE OF MALE PHYSICALITY FOR THIS SPECIES. 

Images flickered across various consoles, drawn from adolescent fantasy and pornography. Heavily muscled, tall, strong, inexhaustible...

CALCULATING OPTIMAL MODEL...COMPLETE. BEGIN TRANSFORMATION.

Dwayne screamed as green energy filled his world, his body warping and twisting under its touch. His flesh felt like it was being pushed and pulled at the same time, his muscled burning as the rippled beneath his skin. He felt his bones crack, heal, and crack again...something was happening to his cock...

Then it ended. He dropped his knees, sobbing for a moment before standing again. A mirror dropped from the ceiling and floated towards him. Dwayne looked at himself, his eyes widening at the fight.

Where there had been only a runty teenager now stood a seven foot tall giant. His body was perfectly muscled, like a statue of a Greek god. His face was rugged, his shoulders broad...and swinging between his legs was a truly massive penis. 

He felt...alive, full of energy ready to explode. He needed to fight something, he needed to fuck something, he needed both and more. On fire, ready to kill.

A door opened to an adjoining chamber. His nostrils twitched as they caught the scent of a bitch in heat...