She let us go

"Okay, you can go." As Nathalie spoke this, I felt relieved. Kate and I both grabbed our clothes to get dressed, when Nathalie spoke up again: "Oh, but I'll keep your underwear. See it as a reminder not to do this again." Knowing it was senseless to protest, we both handed our underwear to her and then got dressed with our remaining clothes. It was very noticeable that Kate was no longer wearing a bra.
"Good, now you can really leave. I wish you two a good night." Kate left first and I followed her quickly, before Nathalie would change her mind. But as I left she spoke up again: "Oh, Laurin, be sure to knock on the bathroom door a couple times tomorrow morning. We wouldn't want you walking in on anyone." She smiled and winked at me.
"Sure. And you wait for the one inside to give his okay before barging in." I smiled back at her and left.

'Holy shit! What the hell was that? Am I dreaming?' I couldn't quite comprehend what just happened. Pulling out my phone, I noticed I had a message from Kate.

"Did that really happen?" -Kate
"I guess so." -John
"Holy shit!" -Kate
"Think we'll get our underwear back?" -John
"Fuck the underwear! We were just naked in front of Nathalie!" -Kate
"Yea, I know. No one will ever believe that actually happened." -John
"No one will ever hear about this!" -Kate
"Oh, I thought you'd at least tell Vanessa about this. You're like best friends right?" -John
"Well, we are, but I don't know. I'll probably not tell her." -Kate
"Anyways. Ready for round 2? ( ͡° ͜ʖ ͡°)" -John
"No! xD Good night!" -Kate
"Nighty!" -John