Rebecca/Eric took the pint of sparm and drank it down.
Suddenly, Erics body of throbbing gigantic muscles fell to the floor with a thud as the changes started.
Their minds couldn't take it anymore, the pleasure they began to feel was crippling. His body expands and becomes black and scaled like a snake.
His muscles were growing and tightening, becoming giant lumps in his arms and legs.
With a sickening crack,pop and hiss, his bones popped out of their joints and grew to about 13'7".
His hair was now longer and a deep shade of sexy blue and the abs had now grown to a full max out-20 pack and rock hard.
His legs looked the same but she could feel them growing stronger and turned dark red...
Then came the fun changes...
A loud stretching sound began to fill the house, like someone pumping up a basketball, only many times as loud. “Fuck!” Eric moaned as he arced his back forwards, his vertebrae grew larger preparing itself for the changes happening “It’s coming! It’s COMING! YEAHHHHHHH!!!” he laughed as a smile of pleasure appeared across his face.
His skin started developing large bumps which turned into large long tentacles which can absorb the life-force of anyone it touches.
His final change was a pair of EE cup breasts, a vag behind hir balls which have grown much larger.