Three fics in which Giles is very cranky, and Buffy tries her best to help him out of his funk.
Frustration by Rari Coss (Giles/Buffy - FRAO) season 4. Giles has neglected his personal needs for far too long. Ethan offers to help, but he isn't who Giles has in mind. Neither is Buffy. I love Ethan in this one, and talky sex? My fave!
A Birthday Gift for Giles, part one and
part two by Susan MD (Giles/Buffy - FRM) season 4. Giles feels like he's been pushed too far when Buffy decides to give him an unwanted birthday gift. Maybe he's being a bit hasty. This fic contains the most erotic non-sex scene I've ever come across in fanfic. Yowsa.
One Long Summer by Tevye (Giles/Buffy - FRAO) post-season 4. I know this has been recommended recently, but I think it compliments the other stories so well, I am adding it to the disgruntled Giles mix. Fantastic and smoldery. Very nice.