The Prince and Farah from Prince of Persia: The Sands of Time. It carries over a bit into Two Thrones, but most of the romance is in the first game. Kakulukia. :)
Oh, that's a good one, I'd forgotten. I pretty much relegate the story/romance excellence to the first game, heh. (Gameplay's good in that last one, though, and the frame of the story isn't terrible. Why the heck did they change Farah's character model and voice so much in Two Thrones? She's supposed to be South Asian, not ****ing white!)
Edited to add: although you might well ask why the Prince of "Persia" is a white, British dude. But at least that's established in the first game and not changed mid-stream.