This happened almost two years ago when I went on a short city trip with my ex-girlfriend.
Almost every day, we ordered room service for breakfast. Since I’m an early riser, I usually took the first shower. Then my girlfriend would shower while I got dressed. She would just put on a bathrobe afterward, and then room service would arrive.
For me this was already extremely exciting, since she would be completely naked underneath her bathrobe. And the bathrobe was short, it stopped well above her knees, and when she sat down on the bed to do her make up the bathrobe would creep a little up so that it just barely covered the top of her legs.
(See the first picture, which I took a day or two before this happened.)
One day she sat down on the bed in a different position. I did not notice it at first, but her pussy was completely visible and on display. The room service guy knocked on the door. I opened the door to let him in. It was our usual waiter (who was in his mid thirties) and he was accompanied by another guy (very nerdy looking young man of about 18-20 years old). My guess is that the older guy was teaching the younger guy how to do room service, because on the other days there was only one person bringing the breakfast.
Only after these two guys walked in I noticed my ex-girlfriends pussy was clearly visible to everyone. She seemed to be unaware of this and was just doing her make up.
The older guy acted completely professional, but the younger guy tried to look at my girlfriend several times. When these guys walked in they asked where they should put the breakfast. I said on the breakfast table, but my girlfriend almost simultaneously said on the bed. So this young guy even had to put her breakfast just in front of her.
A few minutes later I took the second picture and then I told her what happened. She was shocked. "Why didn't you warn me?!"