A/N: So, there was obviously no reciprocated romantic feelings whatsoever on the Doctor's part, but you must admit he had a little sexual tension with Martha! This explains, I guess, where this one comes from. I've edited what they say pretty much completely.
Goodbye
She knows what she's going to say to him. She's been planning it ever since he little trip around the world – no, ever since she realised her mum and dad were in danger. She's sitting in the captain's chair and mulling it over, while he sets the dials for their next destination.
"So, where to next?" He looks up hopefully at her.
"Home."
"Oh … okay." He stares at her and she has to look down, the gaze is so penetrating. She plays with her thumb nails, stretching the dry skin back – they're still calloused and worn, even though the time that happened technically didn't happen – and when she looks up again, his eyes are still burning, boring into her. "May I ask why?" he says after what seems forever.
"You know. I can't … I can't do this forever. Before, I couldn't just play second fiddle to a memory, but now … I've seen what the whole package is, and I can't do it anymore. I can't do it to them."
"Yeah," he whispers, "you were brilliant, mind. Molto bene." He smiles but it doesn't quite reach his eyes.
"So were you." She stands up and walks over to him. Suddenly she's too close and she's wishing she'd stayed where she was, because she doesn't want him to get the wrong impression and now he's looking at her, puzzled and she's not sure what she's doing with her hands and – God, has he always looked this old?
She reaches up and gives him a tentative hug, breaking the awkwardness. "I'll see you around, though!" he says.
"Not if I see you first!" she retorts, jokingly, then sees something fall in his face and immediately regrets it. "Thank you, Doctor. Thank you for everything."
"Your welcome." She feels irritated that he doesn't return the favour.
And that's when she remembers why she's leaving him.
You know what to do by now ...