The doctor Samantha Stephenson was one of the responsible of the transformation parasite incident, she was one of the survivors, so she kept working secretly on the subject.
With time she made her own secret lab, testing a little in a parasite she found, it was small and inoffensive, eventually she took a liking to the parasite naming it Wormy. She always wanted a kid but she couldn't, maybe she saw the parasite as one, investigating the breeding properties of the parasites.
One day the government forces discovered the lab, breaking down the door instantly and entering surrounding the doctor.
"Doctor Stephenson, we have been tracking your actions and you must stop all this nonsense" The leader said.
"I'm sorry but I don't know what are you talking about" Samantha replied and smiled.
"We know you are involved in the parasite incident, many of the scientists decided to stop their work after that, but you continued"
"Is a little research sir, it won't harm anybody"
"We don't know what exactly are you planning, but I order you to stop"
"Sure" she said raising her arms. "However..." She run to her desk, grabbing a jar containing Wormy.
"Finish her!", The forces began to shoot. Samantha managed to quickly run and hide over a wall.
"Well my sweet little child, it's our time to shine!" She opened the jar putting Wormy on the floor, the pulled down her pants and panties exposing her non shaved vagina to her parasite, it quickly obeyed her and entered in the depths of her private parts reaching the uterus and fusing with it. Samantha felt a stream of power running over all her body, "They won't stop us" she said loudly, her transformation was about to begin.