She has to wear a diaper

“First of all give me the bathing suit” said Vanessa

“B...but I’ll be naked” Replied Lauren weakly

“You talk as if I’ve never seen you naked before, besides you’re already halfway there”

Lauren reluctantly stripped off the swimsuit, her nipples immediately became erect once again, god she hated how pointy they got. She handed over the swimsuit and was now standing completely naked in college.

Vanessa giggled at the site of her nude sister again as she scrambled to cover up

“Good girl! Okay I’ll give you your clothes once you agree to the condition”

“What’s the condition?” Lauren asked nervously

“Instead of underwear, you have to wear... this diaper!” Laughed Vanessa as she pulled out a diaper, complete with little unicorn patterns on it

Lauren’s jaw dropped “I can’t wear that! What if somebody sees?”

“Well you’ll just have to make sure nobody sees you then, if they thought you were a kid then, imagine if they saw you in this” Vanessa laughed

Lauren just stood there, dumbfounded and naked, not knowing if she could possibly risk wearing a diaper around her college

“Okay fine, enjoy spending the rest of the day naked, I’m sure everyone would love to see those little bug bites of yours again” Vanessa said as she walked off

“NO WAIT, PLEASE! I’ll... I’ll wear the diaper” Lauren said desperately, terrified at the thought of even more people discovering her pitiful little body

“Great! Get on that table there and let’s get you diapered up!” Vanessa said enthusiastically