if espeon64's reservation expires, then you may of course take another spot. I'd say to wait for espeon64 to post before reserving again, though-- I think it'd be better to prevent the thread from turning into a list of reservations or anything like that...
I'm usually free during the afternoon~evening, but I'm not always logged in the forums. It'll be easier if you could log on mIRC and PM me whenever you want to play.