Now, with such a wonderful (possibly even classic or cliché) title as that, I surely have your attention!At least 100 years ago
, someone here posted an idea that was pretty cool. However by the time I saw it and tried replying, they were long gone.
So now I'm selfishly advertising for this idea
There is a travelling champion of justice. You know, a heroic sort. Specifics don't really matter. They encounter, several times, a villain, one who quickly becomes their arch-nemesis. It seems as though they are drawn together by fate, and must battle several times, never slaying each other, and whenever one is wounded enough, they merely retreat, swearing to best their foe next time.
Except at some point, they begin to fall for one another. Perhaps the battles excite them, with Ikkitousen-style exploding clothes (attacks shredding clothing), grappling and the like, along with the rush of endorphins from battle, all contribute to help them enjoy the experience. Soon, they begin finding excuses to see each other, practically selecting tasks that would ensure the other would intervene. They start resorting to less lethal attacks, perhaps, confused about their motives and hoping to gain dominance over the other.
The original idea was for the villain to have a degree of demonic ancestry, so was acting on hard-to-resist urges, and eventually when they were "together", almost had a sort of "deal" with the heroine, where she would let him/her tie her up, "rape" her, beat her etc. to let the urges out, and she would do the same to him/her afterwards, to help tame the beast. We can go with that angle or not - it needn't be planned out in advance.
The way I see it, their meetings and battles would be handled by game rules, allowing for optimisation, randomness, tactics and the uncertainty of combat. For anything else, rules can be forgotten and the whole thing freeformed. So indeed, if they end up together, as a happy couple, there could be a point where rules stop being part of the game.
So, what system? I'm actually thinking of not using D&D 3.5 for this. Here are possibilities I have in mind:
4E - yes I know I said it's the antichrist. But it could be a nice test, and if we make it level 20-ish, it will safely mean there's no risk of accidentally killing each other... seriously. One can even do the "Knock them down to bloodied, Intimidate to end the fight." trick.
Mutants and Masterminds - the idea is fantasy, but M&M can still work, with a little change of flavour. It'd be a bit odd, I admit, but has the benefits of people being able to be bashed about, knocked huge distances and not get killed from the attacks.
BESM 3E - BESM covers fantasy just fine, after all. This one allows for players to have a pretty good idea of how much of a beating they can take, and allows for customisation.