I was at the beach with my cousin and a couple of her girlfriends. She decided it would be funny to pull my swimsuit down. She tried but only managed to get the backside of it down briefly as I managed to keep the front of it up. Only my ass was exposed to the beachgoers but the fact she was fighting to pull them down and I was fighting to keep them up my ass was exposed for a good 10 seconds giving everyone a good look at it. I had to get her back. I managed to pull her top and have her boobs pop out but only for a quick couple of seconds. We then made a truce and decided we wouldn't do any more. Me, her and one her friends walked towards the water to go for a swim. Her other friend stayed back to watch our stuff. As we neared the water her friend pushed me and I fell face first into the sand. I then felt my cousin pull my swimsuit off leaving me naked. The 2 of them began to run away towards the big crowd of people so I decided to run back to my stuff to grab a towel. I realized the other friend who stayed with our stuff was gone along with all our stuff. I then looked to see the 3 of them together in the distance shouting for me to come over and get my stuff. I then made my way through the crowd to where they were with just my hands to cover myself. People on the beach were whistling and clapping. They got me back pretty good so I was very impressed with them and not angry. They gave me my swimsuit back and the crowd was still making whistling sounds and clapping. Instead of putting my suit on right away I turned to the crowd and began to take bows and had my arms in the air accepting their applause. Doing this created more whistling, clapping and cheering as I was now fully exposed to everyone on the beach. I put my swimsuit on and to our car we went and left.