I only remember that it wa up a few years ago on myincesthentai. Starts with a small (maybee shotocon) boy staying with his brother or cousin, some relative for the summer. He normally has short hair but grows it out for the summer. It opens with the boy being fucked by his relative. After finishing he is asked to go to the beach tomorrow. They go the next day and the uke is in a nice 2 piece swimsuit. He sees a friend from school who recognizes him even with the long hair and they end up having sex on the beach in se private cove. Anyone know the name?

http://www.yaoiotaku.com/boku-no-pico-anime.html

I dont know if this is it or not