Tease her

"Oh Helena, those little bunny panties are cute, did you get them at the child section of the store?"

Helena blushed "I... I... No, but I like them they are comfy. And don't tell me you don't have childish panties on, I know you love them too, don't you?"

Lauren suddenly remember her choice of underwear and blushes deeply "Wh... What I'm wearing is none of your business, I'm not the one showing them"

But before Lauren could put her lab coat, Helena sneaked behind her, unzipped her skirt and pull it to her ankles, exposing a bright pink panties covered by rainbows and unicorns underneath her pantyhose

Lauren gasps "Helena! What the..." she bend down to pull her skirt up, and Helena took this opportunity to pull down her pantyhose as well, giving her a clear view of Lauren's choice of underwear.

"Come on! stop it!" Lauren blushes

"So, those are grown-up underwear for you? And you're making fun of my bunny panties, miss unicorn" Helena laugh

"Sh... Shut up, you wasn't supposed to see them" Lauren said as she quickly pulls her pantyhose back up

"Don't tell anyone about them, ok?" she said as she zips her skirt.

"Don't worry, I'm just teasing you, actually those are adorable."

Lauren blushes "Th... Thank you, yours are really cute too" she smiles