Tiny Human Heads, by
lordshiva.
Hard R-ish. Ten/Sarah Jane.
The Doctor is on a mission to tell everyone he loves that he loves them.
Spoilers: Doomsday
"Is Earth being invaded again?”
“No.”
“End of the world, some kind of apocalypse?”
“No! Look. It's- it’s a sort of New Year’s resolution... thing, I’m trying. ”
“Since when do you-“
“Hush! My resolution is to tell everyone I love that I love them. With actual words.”
Ten and Sarah Jane talk, have sex, and watch movies, and it's hilarious and genuinely touching.