Well, OK, it wasn't exactly a fanfic, per se, more like an extended exchange that included fanficcy stuff. Back when this comic was last posted, I made a comment that went something like 'anyone else want to see these two as roommates now?' faile_neume went 'YEAH!', and I responded with a quick little vignette where Supes and Selina were living together. Well, she responded with 'ooh, how about this', and I kept putting together little scenarios, and before we knew it, the whole thing had morphed into what was basically an elaborate 'I Love Lucy'-style set-up where Clark and Selina were married and had Kon as their 'son' in white-picket-fence suburbia, and they lived next door to Green Arrow and his family, and it just got more complex from there. It eventually kinda petered out, as these things do, but it was pretty awesome for a while there. I'm not sure whether anyone else read it at the time, as the exchange was pretty much just between the two of us, but the thread's still there if you want to look at it. (Also, faile_neume said she'd post it on her Live_Journal.)