G-Man & Xand-man (NC-17) Giles/Xander
Giles' New Love Life (NC-17) Giles/Spike, Giles/Ethan
I Love You (NC-17) Giles/Xander
I'm Yours (NC-21) Giles/Spike
Licks etc. (NC-17) Giles/Spike
Lovers Again (NC-17) Giles/Ethan
My Beloved Wolf (NC-17) Giles/Oz, Giles/Ethan(implied)
My Boy (NC-17) Giles/Ethan/Xander
Nightmare (NC-17) Giles/Xander
Nightmare 2 (NC-17) Giles/Xander
Nightmare Reflections (NC-17) Giles/Spike - BtVS/DS9 crossover
The Real Rupert (NC-17) Ripper/Ethan
Sire and Childe 1 (NC-17) Spike/Xander
You and I, Forever (NC-17) Giles/Xander
You Only Die Twice (NC-17) Giles/Ethan, Giles/Buffy/Ethan
The Young Man With the Acoustic Guitar (NC-17) Giles/Spike
SERIES:
Giles' Lovers Suite Giles/various