Susan moved through her high tech lab in the attic, writing down the inventory of all her equipment and other supplies, as she prepared for the experiment to come. She had a new device she wanted Johnny to test out for her, and was certain it would work, if not a little too well as they usually did.

As she turned to go and get Johnny, she paused as her belly bumped into one of the machines she forgot was behind her, and that caused her twin Mary, to thrash around inside her womb slightly in response.

"Sorry about that Mary." Susan said, placing one hand on her belly as its shape distorted and shifted.

To anyone not in the know, Susan looked like a normal pregnant teen mom, just days away from delivering a pair of full term twins. But in reality, Susan was pregnant with her younger twin sister, after an experiment that went wrong five years ago, had ended with Mary somehow becoming permanently trapped inside her older twin sister's womb.

It wasn't all bad though, despite not actually being pregnant with a pair of babies, her body was still reacting to this as if she were actually pregnant.

Her body had adjusted rather exceptionally well to the pseudo pregnancy, with her breasts having grown into full firm and perky M-Cups, filled with milk, her hips growing a bit wider, and her thighs had grown thiccer, making her clothes hug her tight in a comfortable way, while she was completely topless, leaving her completely naked from the waist up, and having foregone her shirt, since it couldn't even cover half her belly, leaving her pierced nipples exposed, and had traded her skirt in for maternity yoga shorts, while she still wore her white lab coat, over her shoulders, but still left her living the lifestyle of a partial nudist.