Season 4 The Harsh Light of Day re-write

I'm looking for a fic, a one shot i think that was basicilly a re-write of Season 4 The Harsh Light of Day. It starts where Buffy runs into Spike and Harmony at the frat party and like in the ep she chases him but as they get arguing things heat up, i can't remember who inisates it but i remember Buffy and Spike sleep together and Harmony catches them right at the end and Spike stakes her. Does anyone remember this fic?

Thanks everyone : )

I found it.

Ruthless Night by Ashlee

http://dark-solace.org/elysian/viewstory.php?sid=218&ageconsent=ok

Buffy's date with Parker ends up taking a turn for the better...

Since the fic found fits the criteria and it has been near a year, I am going to move this to found.