bonded can't walk away from eachother?

a story where they can't walk more than a few steps from eachother, set maybe between season 4 and 5 summer....i think it's willows fault. i think they stay at buffys place...

I can't remember why/how but they have to be within 6ft of each other in this-
Denial by The Enemy of Reality.
Forced to be close together for an infinite amount of time, it stands to reason that mortal enemies would drive each other insane. But when it comes to a self-righteous, uptight slayer and an irritating, chipped vampire, there is no reason.

In Favours by Pale Rider (on this site) they can't be more than a few feet away from each other because they are bonded.