Sri lanka girl friend - part 1

Hello to everyone, I'm from Sri Lanka an Island nation in the indian ocean. This is my very first story.
This is a 100% true story which happend many years back. Me my long term girl friend(shivanthi) and her best (melanie) and best friends younger brother (dan) visited my girl friends aunts (kumari) home in " Katubedda" a 30 minute train ride from colombo. Once we arrived to aunt kumari's house we decided to go to the beach in mt.lavinia.
So changed in to shorts and t-shirts and took a tuk tuk to the beach. Once we arrived at the beach we started to play and fool around in the sand and sea. After a while i noticed dan checking out my girl several times. I caught him peeking at melanies boobs once. Both the girls t-shirts were transparent by now and they were clearly attracting attention from the boys at the beach as well as mine and dan's. I saw Dan carry my girl shivanthi once and his hand was on her ass. For some reason i started to like this and it made my cock twitch. I allowed all this play to continue
As i wanted dan to touch my girl more, where ever he liked. My girl had known melanie and dan her entire life so she wouldent think he would touch her in a sexualized manner, but i had my doubts as i spotted a semi boner in dans shorts all the time.

Let me know if you like to read the rest.