Oh Sweetie... Allow me to continue a scene from Forest of the Dead:

DOCTOR
So some time in the future, I just give you my screwdriver.

RIVER (smiling)
Yeah.

DOCTOR
Why would I do that?

RIVER
I didn't pluck it from your cold dead hands, if that's what you're worried about.

DOCTOR
And I know that because...?

RIVER
OK, so I kill you a couple of times, but honestly, we're *fine*! And to be honest, you kinda like that about me, actually. Because you're twisted.

DOCTOR
...

(Insert any Spike/Buffy quote you like - really, they just keep hitting all my favourite kinks. /is easily pleased)