I[M] fucked my classmate[F] on my teachers boat

So this is quite a long but fun story.

When i went to professional school, there was a girl in my class that id always deemed hot.. I knew she was sexually very open and we always got along well but without any sexual tension.

So forward to the end of the school year(summer). We planned a farewell party at a teachers farm, he was in the middle of renovating of. So naturally there was a lot of space there. We had a Barbecue, lots of beer and liquor. Drinking age here is 18 BTW , most of us were in our early 20s anyway. So as the night moved on everybody including our two teachers had a buzz going. At around Midnight there were only a couple of people left, including me and the girl. Shes about 5‘7“, dark hair, nosering and a nice round booty with c cups.all the while not being athletic she still had a nice tight body . So we played a couple of drinking games together and it got Flirty from both of us. We went over to the campfire and she immediately sat down on my lap.