"Mmmm doesn't seem to fit right" Jeff's mom says, much to his relief. "Oh I must have been made the wrong size! I'm safe, she'll surely take me off now!"
Jeff's mom begins taking off Nina's diaper, but Jeff's joy is short lived as he is flipped around and Nina is lowered onto him again. "Would be just my luck I put her diaper on backwards when i'm so busy. Glad I caught that before we had a mess!"
"Oh no!" Jeff tries to cry out as his sisters bum lowers onto him, his face positioned so he can see a canyon before him which opens up a little to reveal her anus directly in front of him. It had never occurred to Jeff that Nina might do more than wet him, but he was fully aware now as his mother locked the tabs and sealed his fate.
Just as she finishes her phone goes off with a text tone. "Oh good my neighbor can come over to look after Nina" she says as she types out a reply. Within a few minutes the girl next door, Julia, knocks on the door. Jeff admitably had a crush on her, and couldn't be more glad that she didn't know he was in this form, but he had much bigger things to worry about. After a short conversation, Nina is handed over to her and his mom heads out.
"Alright before we play we should make sure that tank of your is full, how about we get you some breakfast!" Julia says as Nina excitedly babbles in response. She is placed in her high chair, putting immense pressure on Jeff as he is pushed more into her ass. As Julia begins feeding Nina, Jeff can hear terrifying sounds coming from her; the sounds of her bowels becoming active. Jeff felt like he was being walked to his execution, as it was only a matter of time before the food she is eating makes it way out the other end.