Buffy's still in high school when I think she is looking for a mate or something silimlar, Giles realises whats going on and builds a fort of crosses outside where he willow and xander watch vampires fight for the privilage not much else to go on xx

http://dark-solace.org/elysian/viewstory.php?sid=3525

I think this is what you're looking for, Somno Negeltu By spikesgirl 8472 (not sure about the spelling).

Yes that's it thank you x