This one is the only one I think of but it's really good. I might read it again. It's been a long time since I read it.
The author had all her other stories except this one on SR. I'm glad I found it on this other site.
Blast from the Past by Zarrah
http://www.nocturnal-light.net/fanfiction/story/411/Blast_from_the_PastSummary: All Human: Fantasy AU...Gathering for their 10 year class reunion the 'girls' enjoy reminiscing of days gone by. A night of naughty viewing pleasure turns their worlds up-side-down when they realize that the guy they had all been ogling was none other than the geeky nerd William they had all went to school with! Complete