2 ideas
1) I like fics where one of them is really sick and I’ve not read one exacty like this although I came to the fandom kinda late and I might have missed something, but anyway, I’d like to read a series where they’ve been together for years (maybe five or six, that’s up the writer) and then Luke either
a) loses his sight (the reason is up the writer) (and yeah, I don't care if that reminds people of Noah's case)
or b) finds out he’s got some kind of cancer or other serious disease.
2) A series that picks up when in that second kiss they actually have sex, because I’m curious to see how people imagine the story would have developed from there.