Hmm. I think the first HP fic I read was way back in either late 2003 or 2004, and I definitely started with Harry/Ginny. (Yes, I know. xD) This was A) before I'd read any of the books, and B) largely because I was running out of interesting fic to read in the Ranma 1/2 and InuYasha areas on FF.Net, and, hey, some of those fic look interesting... xD My first slash was later in 2004, and was Draco/Harry, and with typical teenager fascination, I started reading that almost exclusively after a while. And I probably started reading Snarry after the interesting-sounding Drarry started to dry up, and I know there was a short period when I found Snape/Hermione intriguing.
I think something about Snarry just clicked with me, because that's been my favourite HP pairing ever since, though it probably took a bit of an adjustment period. It got to the point where I actively avoided writing and reading het for several years, but I've been getting back into that just a little, probably prompted by my brain dumping girl!Harry at me and me going, "WUT U WANT?!" at it in reply, with a side of, "That's interesting. But most Snarry fen don't LIKE girl!Harry, brain!"
I'll be buggered if I can remember any of the names of fic I read that long ago, though; I do good if I can remember the names of ones I read last week! I do know one of my favourite Harry/Ginnys back then was written by Lolly Phoenix on FF.net.. I think it involved teen parenthood and Tonks as a surrogate and triplets? LOL. As for Draco/Harry... I was a huge, huge fan of stuff by desolate03 (also on FF.net), and actually that person's stuff was the only stuff I really liked with top!Harry. I guess I've always been a bottom!Harry girl, thinking about it. xD As for Snarry.. I think the_con_cept features in there (Pink has left me with a rather uncommon liking of flamingos, actually. ;D), but... I can't remember the names of any other authors I liked back then! xD
Oh yes. First time I saw Snarry, I think I was like, "Ew." LOL. But obviously I've changed; HP fic has introduced me to so many things that I probably wouldn't have realised was interesting for many, many years without it. Probably at that point my biggest thing was the age difference and the way he treated Harry in what I knew of canon. In fact, I think I read Severitus fic before I read Snarry, which probably paved the way at least a bit. It's really funny to think that the age difference was a problem, considering I was a HUGE InuYasha/Kagome fangirl, and it's totally canon that he's a LOT older than her. Even with the "frozen in time by a purified arrow" thing. xD
Hm. Long comment is long and getting off-topic. I go eat my breakfast now. :D