[eviltwin]

I'm from Scandinavia, where we have a fairly open-minded view on sex and nudity. Combined with various other aspects of my life and activities, I've had the fortune of witnessing several instances of embarrassed nude females, casual nudity and exhibitionism.
In this thread I'll try my best to recount them for you.

I'll start with the first one, chronologically. This happened at a time where I was still a virgin, and had never witnessed a nude girl up close. I had, of course, seen photos, and also topless women at the beach, but never someone I knew, and never up close, as I said.
In my class there was this one girl who I'd known for several years, ever since we were kids, but we went to different schools until the final 3 years. Let's just call her Linn. She was a really cute blonde, long hair, petite but with large breasts. I'd never really thought of her in a sexual way before, though, since we kinda grew up together.
In our final year we were having a class trip. The destination was her parent's cabin, were we would go skiing. It was large for a cabin, but still pretty cramped with our entire class of 25+ students. All the boys slept on mattresses on the floor and in the sleeping attic (an attic open to the rest of the cabin). The girls were given the various bedrooms, but Linn volunteered to sleep on the couch in the living room, as there weren't enough beds.
The first night, when we all went to bed, Linn went around hugging all the boys goodnight. Nothing overtly sexual in it, but a little flirtatious. Her outfit however, was another issue...
While the boys all slept in their boxers, perhaps with a t-shirt, and the girls all had modest nightdresses, pyjamas or long t-shirts, she was dressed in black, lacy underwear with a small, see-through negligée over. She had a great body, and this outfit only enhanced it. I think she relished the extra attention she got because of it. It was a small cabin, however, and nobody could have done anything without everybody knowing, so we all went to sleep shortly after.
The next morning I went over to the kitchen/dining table to have breakfast, but there were no free chairs, so I took my breakfast and went over to the couch and the table there. There was a couch and a couple of chairs, and Linn was still sleeping on the couch, so I sat on a chair opposite her. She was starting to wake up now, and sat up on the couch, letting her blankets drop down. I then discovered that she quite obviously slept topless!
Suddenly I was facing her and her perfect, large breasts on free display. None of the others could see it from where they were sitting, and I was stunned. She looked magnificent.
She started chatting with me, and I did my best not to stare at her breasts. I'm pretty sure that she was fully aware of the situation, but that she pretended not to notice. Her display the previous evening had already convinced me that she liked that kind of attention. We chatted a bit for at least some minutes, when one of her friends, another girl from the class, joined us, and discretely made Linn aware of the situation. Linn exclaimed "Oh!", put on an embarrassed smile and quickly pulled the covers up, saying sorry and acting a little embarrassed. I just smiled and laughed it away.
I never saw her naked again, and the scene did not repeat itself the following day, but I've carried the mental image with me ever since. It was a first of many things, first time I saw naked breasts up close, first time I saw someone I knew naked (at least partially), and my first brush with ENF/exhibitionism (a little of both at the same time, actually).