Buffy cheats on Riley with Spike

Buffy is a human who is in a bad marriage with Riley Finn. Buffy ends up at a nightclub where she gets picked up by Spike who is a vampire but she doesn't know such things exist. Spike becomes so attracted to her he finds he can't and doesn't want to kill Buffy. I think Spike eventually ends up killing Riley because he hurt/beat up Buffy, which enrages Spike.
If anyone can remember the name of this fic, or who wrote it, I would be very happy. Thanks in advance

Gardens of Oblivion by Addie Logan on this site

LOVE THAT ONE! Riley is such a moron! He cheats on Buffy with hookers and gets shocked because she kicks him out.

Niamh, you marvelous, wonderful, person you! I adore your stories and I adore the fact that you've remembered the story I've been so obsessively searching for, for the last few days. It's almost driven me mad, and you've saved me Thank you muchly! You've made my day!
Kathy