Please help me find a yaoi manga

Hi, could anyone help me find a yaoi manga? I remember it was something about a young rich man in army who was about to get married to some army douche's daughter but he was kidnapped by pirates before that, the captain fell for him & at the end the uke realized he fell for him too & rejected his fiance and ran away with the pirate captain to some island where they jumped off a cliff together & kissed under water at the very end of the manga.
I can't remember the name of that manga, please help me find it :3