Alistair and Morrigan, can involve the Warden of your choice; I played with a female human noble. Either art or fic, whichever bites you harder, but something with sex pollen and them still snarling at each other despite acting on it would be so much fun. Whether it's in dark of night so they can pretend it isn't happening, or full daylight so it can't be missed, is up to you.
Dragon Age: Origins