If you made a harem hentai game..

maybe a game of survival. plane crash on an island (sound familiar) and a few men and several women survive, maybe because there were many more women than men on the plane. eventually some of the men die (or just the one guy made it out alive) and he is surrounded by the remaining women.

well, i think that depends on the mood of the game. if you want lively and fun, maybe have the guy just help out the girls and maybe have him spend some alone time with each of them as they perform tasks around the island, like gathering fruit and hunting. maybe have him save one of the girls or maybe have him have special skills that come in handy in the survival game and the girls have to rely on his skills. if you want more of a action packed game, kinda same thing as above but add more elements where they are fighting to survive and in doing so he spends quality time with the women or something. i'm sure there are many bizarre and creative ways you could take this story. you could also have the typical competition among the girls to see who gets him first.