I'm a 27 year old female. When I was 13 and just getting into masturbation I went to the beach with a few friends, guys and girls. I started feeling a little horny from the boys looking at me in my new bikini (the first time I had owned one) and to my intense embarrassment began to feel a little dampness between my legs. I quickly excused myself, saying I was needed the bathroom, and ran back up into the dunes. I knew we were the only people on the beach and everyone else was down by the sea so I quickly pulled off my bikini, lay back and began rubbing tits and pussy, hoping to get it out of my system. I began to feel a need to pee but thought I could hold it as I was getting really into my 'bathroom break'. The next thing I knew all my friends, guys and girls, were coming over the top of the dunes and stopped, staring at me (I later found out I'd been gone 20 minutes and they came looking for me). The combination of the shock and humiliation of being caught masturbating must have pushed me over the edge and I simultaneously came and wet myself right in front of my friends. Everyone was very quiet around me the rest of the day and I've never lived it down to this day.