Tenth Doctor/Tosh - Don't ask why, I'm not sure, OK?
No spoilers, very AU.
Quite possibly not very good.
He listed things they had in common in his head. Normal things, like normal humans.
- Cleverer than everyone around them. Fact.
- Not conventionally, but undeniably, sexy. Fact.
- Lusted (secretly or not) after Captain Harkness. Fact.
Obvious. So normal.
A shared coffee.
A widening of his eyes as he heard her explanation of the mechanical printed circuit board.
Her jaw dropping as he lovingly described the formation of a supernova in terms of electrical energy.
Soft, normal caresses in overlapping shadows between the (not normal) TARDIS and water tower.
The melding of like minds.