Marcus is ffutures on LJ, and he's posting new chapters here first before updating them online.
You can also find the whole thing (all completed chapters to date, that is) at Twisting the Hellmouth (http://www.tthfanfic.com/) and leave feedback there, though you have to register first. Here's a direct link to The Key to Byzantium (http://www.tthfanfic.com/story.php?no=5220) at TTH.
Marcus has also written some other very good Buffyverse crossovers, and you can find them all here at TTH (http://www.tthfanfic.com/authors.php?no=178).
His own web page is Forgotten Futures (http://homepage.ntlworld.com/forgottenfutures/), but I don't know if he posts any fanfic there since I've always read his stuff at TTH or on LJ.
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You can also find the whole thing (all completed chapters to date, that is) at Twisting the Hellmouth (http://www.tthfanfic.com/) and leave feedback there, though you have to register first. Here's a direct link to The Key to Byzantium (http://www.tthfanfic.com/story.php?no=5220) at TTH.
Marcus has also written some other very good Buffyverse crossovers, and you can find them all here at TTH (http://www.tthfanfic.com/authors.php?no=178).
His own web page is Forgotten Futures (http://homepage.ntlworld.com/forgottenfutures/), but I don't know if he posts any fanfic there since I've always read his stuff at TTH or on LJ.