I have always been thinking about certain development in some characters like batman and joker, harry and malfoy, naruto and sasuke, etc...that if one of them turned female or where female it would create a perfect pairing.
They would develop a deep relationship and then proceed to hate fuck the crap out EVERYDAY when they notice how they feel for each other, they would be in negation at first of course, but then they would crave for each other, in fact I think they were made for each other, like an instinct.
Like a fem.joker having wild crazy instinctive reverse rape with batman and both loving every second of it until she get pregnant and heal each other wounds while struggling to raise a pair of children or naruko reverse rape sasuke to submission and like it OR harry and a fem.draco would seek for each other and hate fuck until impregnation and no matter what they do or how much they fight..in the end it doesn't even matter, they will say I love you and make love passionately.