2 fics found!

Love in Motion by Jacinta and Tagmus (NC-17)
Buffy and Giles are on a trip to Europe. So many places to visit (and make love in/on ;) (unfinished)

The Tropical Giles Series by Jacinta (NC-17)
After the defeat of Glory, the Scooby Gang heads off to a tropical paradise where Buffy gets a real "eye-opener" in more ways than one.