Leah just sighs and accepts it. Tina can't seem to view her as anything but a toddler or baby, so there's no talking her out of this. Her stepmom lifts her up and sets her in the cart.
"Thank you for getting mature about this," Tina says brightly. Leah shrugs.
They shop for a few minutes, until Tina notices Leah squirming a bit.
"Do you need to go potty?" Tina asks her teenage stepdaughter. Leah bristles. She actually does, but not if Tina is going to phrase it like that!
"No, I'm fine," Leah says firmly. She can hold it. Tina just shrugs and continues shopping. Eventually, they turn down an aisle with a woman pushing a cart with a baby in it. Tina busies herself looking at the shelves, while Leah gets distracted by the baby in the cart. It's a little boy, close to toddler age, and he's hunched awkwardly, grunting loudly. It takes Leah way too long to realize that he's messing himself.
The boy's mom just ruffles his hair and continues looking at canned goods. The boy and Leah make eye contact. Leah's bowels rumble, reminding her that despite what she told Tina, she does need to go.
Suddenly, something comes over Leah. She imagines doing what the boy is doing, filling her underwear with poop. The idea makes her weirdly giddy. For some reason, she wants to do it. She wants to copy the baby in the other cart.
The baby grins at Leah. Leah grins back. She eagerly leans forward as much as she can, grips the handle of the cart, and pushes. Out comes a massive log. Leah grunts, still smiling, enjoying the sensation of the mess slowly building in her underwear. Only when she finishes and sits back in her poop does she realize what she's just done. She quickly stifles a gasp.
She just pooped herself! On purpose! And just because she saw a baby do it?! Tina hasn't noticed what Leah's done yet, so hopefully that gives her some time to come up with an explanation. But right now...
Leah whips her head around to glare at the baby. He's still in the cart, grinning at her. Their eyes make contact again, and Leah suddenly feels compelled to do what the baby is doing now, which is...