She rubbed her belly, amazed at how it didn't even look like anything was inside. She knew that the twins were in there, she could feel them even, but just looking at it from the outside, nobody could tell. "It's... fascinating..."
She couldn't get over how she was basically breaking the laws of physics here. Not only did she just transgender herself with the press of a button, she's carrying her seven-year-old siblings in her belly at full size with basically no evidence of them being there, aside from what Jeff herself can feel from them.
Jeff smiled, looking down upon her new self. She had massive breasts, definitely bigger than she was expecting, and was overall slimmer than before. She returned to her room, sitting on her bed. She wanted to fully experience this new body, yet also wasn't entirely sure... There ARE kids in there, after all. There was also a part of her that did miss her old body, but... she didn't quite know