Spike Lips! Lips of Spike! by mr. monkeybottoms:
http://www.allaboutspike.com/fic.html?id=427If you are looking for a good laugh, you
have to read this story! There's not an initial summary on the site, but here are a few highlights: Spike pretends to be weak in front of Joyce so Buffy has to wait on him (including cutting his meat), Buffy pours half a bottle of Tabasco sauce in Spike's mug of blood, Buffy reveals some news that shocks Spike and he steps in a bowl of mashed potatoes, Xander catches Spike and Buffy in the act and a humorous exchange occurs, some of the Scoobies partake in an activity involving Pop Rocks, and everyone's secrets are spilled during dinner with Joyce and Giles present.
Takes place in Season 4, Post-Something Blue and during the time of the Initiative. Riley is present in the beginning, but Buffy quickly gets over him. Seriously, a great fic and a must-read!