In these they are neighbors in an apartment building. I'm not sure if you are looking for a budding romance or just a more 'buddies who have sex' (I hate the other term) situation.
Layaway by moxiehttp://spikeluver.com/SpuffyRealm/viewstory.php?sid=1435&textsize=0&chapter=1Summary: Buffy runs a famous fanfic archive. Badly burned in love, computer dying, psychotic ex- husband, her life's a mess. Spike's her landlord, who's more than interested in her. But can he teach her to love again? Room with a View by Behind Blue Eyeshttp://www.sweet-temptation.net/viewstory.php?sid=376Summary: The first night in her new apartment, Buffy notices her intriguing neighbor. This experience elevates the meaning of appreciation to a whole new level.The Tenant by Sotiahttp://spikeluver.com/SpuffyRealm/viewstory.php?sid=37010Summary: In hopes of getting her fiancé to consummate their relationship before the wedding, Buffy convinces him they should check out the apartment her step father gave her as a gift for her upcoming nuptials. Darkness and privacy are supposed to work for her, but there is one parameter she doesn't know about: the apartment is not empty yet, and the current tenant has no plans of moving. Currently posting – she just had a baby but this story should continue posting and not remain a WIP as far as I can see.
