The little things isn't? Just being aware of each others likes and dislikes, being thoughtful in a thoughtless kind of way. My favourite is Anna S's Subleties, It's such a nice relationship between the two, and often the sex isn't really described in a lot of detail.

Often in some fics the sex doesn't live up to the rest of the relationship. It really is worth wading through to find the good stuff!

I reckon I'll cry when the Doctor "dies". He's so great!