Post AtS, Spike and Buffy lost in the caves

Hi! I remember reading (and loving) a fic that was set in a time after AtS, where Buffy and Spike were working together and where at least most of the fic happens in a cave system they are investigating. Spike is rumored to be seeing another woman (a witch), and Buffy isn't pleased about it. They also fall of a cliff at one point(?). The fic wasn't that long (a few chapters I think) and was very well written. So if someone could steer me to the right direction, I would be very greatful.

We own the night by okdeanna, it on this site

Sorry that by okdeanna

Thanks