She is immediatly suspicious

When Vanessa was out of sight, the other woman turned her attention to Lauren. Her sunny smile vanished, replaced with an elevated eyebrow and crossed arms. "Okay, just what is going on, young lady? You're much too old to be wearing a diaper."

Lauren bolted back. She hadn't expected this. On one hand, she was flattered to be recognized as older, on the other, this woman seemed a little more judgemental. The diaper clad girl gulped, clinging to her act. "I um... have bathroom problems....?" She wanted to kick herself for saying that.

"You can drop the act. I've changed a few diapers, and that, young lady, was not you peeing." She smirked. "You looked like you were enjoying yourself."

Lauren blushed. "W-what!? No way!" She looked around, wondering if anyone was watching her. There was giggling, but was it at her? "I... I did NOT enjoy myself! M-my sister is forcing me to do this! She put me in this stupid diaper and... and..."

"Look, I get it, you have a fetish. I won't call it normal but... I'll call it... well, you're not the only one." The woman shook her head. "I'd appreciate it if you didn't expose yourself in public! You think just because you have a small chest and are a little petite you can fool everyone into thinking you're a toddler?"

"N-no! I swear that wasn't it at all! My sister barged in, blackmailed me and said she was moving in!" Lauren begged. "Please, I need help dealing with her!"