Please, I need help to find a story that i liked a lot, but I read it a long time ago.

It was about a guy who goes somewhere on vacations (I don't remember exactly) and he met with a girl that he had known before when he went to vacation on that place years ago. The girl was in love with him at that time, and she was little, but in the story she's already grown up. The guy tried to be with her but he found that she was with a man of the island (I think it's an island). At the start she doesn't want to be with him, but the man apply a lotion on her (or in his penis and she suck it, i think so) and they have a lot of sex; this happens when the guy is peeping trough the door. At the end the girl is in a Kimono with the guy that had sex with her and they are watching fireworks.

I hope this helps and thanks to the one who can be capable of give me the name of the manga when this story came out.