Yeah, I didn't remind you...oh well, you remembered anyway. :P Thanks for posting this. :D
I see you already included the ones on Pixiv so I won't link there. http://community.livejournal.com/simoun_sibyllae/2558.html This post has a lot of links to Japanese fanart sites that have a ton of Anubituf/Guragief. Some of the sites have some other Simoun fanart as well. Most of the fanart I have saved of these two is from that list of sites.
I may or may not have just spent too long putting this comment together. It also may or may not be too long. Oh well. Hopefully somebody gets something out of it. (...and I may or may not be too biased. :D)
I think the Anubituf/Guragief folder I have is now my second biggest Simoun folder of a single character or pairing... not sure but I know it's my second biggest pairing folder. I know you can guess my first XD
(And it's funny cause it's me and I don't go for bishi boys XD)