[ Right now, he doesn't have any real reason to mess with Dawn. He kind of likes Dawn and between two Slayers, the chip and the fact that he has nowhere to run should things go pear-shaped, Spike's not stupid enough to take that risk without a very very good reason.
That reason has yet to appear. Not that Buffy needs to have that confirmed.]
Oh, this and that... filled in a few blanks about th' whole fightin' on th' side of good an' gettin' a soul business. [ Complete with a vague, wavy all-encompassing all-that-weird-stuff gesture. This is obviously less important. ] She did say something very interesting about you though... an' me.