Okay, then, so, here's the difficult part... I'm not going to make the entire plot, I'm going to help you do it, and add my views when we get there.
Romance:- Kind of self explanatory really, however, is there any aspect of this you'd rather involve, as in, childhood romance, high-school sweethearts, or, possibly, a forbidden romance, between, I don't know, Nobles of Rival Kingdom's, perhaps? Let's hear your idea on that one.
Adventure:- This is another one that self-explains, but, perhaps you're looking for a certain form of adventure, be it Medieval, Sci-Fi... Or just modern-day fairytale's, what kind of adventure would you like the characters to go on, heck, it may not even be a journey type adventure, possibly an emotional one, that could tie into the romance part of things too.
Danger:- Okay, this is too wide to even start giving examples, so, I'll ask you ,what forms of Danger do you want involved? This can be anything that is a danger to Secrecy, Physical/Mental well-being, literally, anything at all.
Hey... I'm not as iffy as I thought I'd be... Not bad, if I say so myself.