We were doing our usual camping trip that we take yearly. Somehow one way or another we ended up in the same room in our cabin because my best friend was sharing a room with his girlfriend. There was only one king sized bed in the room so I offered to sleep on the floor but she said she didn’t care. 
  Night time rolled around and we were settling into bed and there was a decent amount of space between us. As the night went on she gradually slid closer to me until her ass was right on me. At first I thought it was on accident but she continued to grind on my as my dick got harder. 
   Pretty quickly both of our pants were around our ankles and we were skin to skin. She reached back and was stroking it while it was pressed against her ass. I spit on it as she kept going until eventually she guided it to her pussy. We fucked for over an hour. It was fucking fantastic, she has gorgeous double D’s I got to fuck too. 
    It blew my mind how wild she was considering her brother and his gf were in the other room. I wasn’t complaining though, genuinely one of the hottest sexual experiences I’ve had. Her and I sext now and I’ve never told her brother any of this and I don’t plan to lol.