Spike is a single parent and Buffy is a runaway.

I remember reading this fic a few years ago, but I can't remember the name of it. All I can basically remember is that Spike is a teacher at Buffy's school and he is also a single parent and Buffy somehow runs away from home. I can't remember why she runs away though.
Oh and Spike's child is a little girl I think.

Would it happen to be:
I Need You by Tammyash666

Yep, that's the one. I've been off here for so long I forgot I liked Tammyash666's stories.
Thanks.