The thing I like about Ten/Rose in TIP/TSP is that in contrast to the many times Ten and Donna would protest that they weren't a couple when people assumed they were, here Danny greets them with "Here they are, our mysterious couple" or something like that and neither of them flinch. It's the one time Ten doesn't protest that he's not part of a "couple". They just seem so comfortable together there, and the little awkward scene where they talk about sharing a house is just fanfic worthy.