HP fanfic question

[zaftig_goddess]

Since I started reading Harry Potter fanfiction (I guess about 8 months ago?  A year ago?) - I've been reading primarily Hermione-centric fics (Hermione/Snape, Hermione/Draco, Hermione/Harry, maybe an occasional Hermione/Ron if it's particularly well-written) ...but something I read yesterday in a Snape-centric fic has caused a curious little plot bunny to start frolicking in my brain, and made me wonder - does anyone know of any fics in which Snape is actually Harry's father, rather than James?  (I haven't been reading in this fandom long enough to know - maybe this is an idea that been done to death, maybe there are eleventy-billion "Snape is Harry's father" fics and I just haven't found them because anything tagged 'Snape/Harry' makes me want to run away very, very.  (For some reason I am deeply, deeply creeped out by the Snape/Harry pairings - I see that it's a huge part of the HP fandom, but it's just...not for me.)  Anyway, if you know if there are any, particularly any really good ones - can you send me in the right direction?

ZD