I came to Snarry by way of SS/HG. I spent maybe two months reading that pairing and I do remember my first reaction when I heard of Snarry was a bit EW/WTF LOL! But I dipped my toes in within the week and completely jumped ship not long after. Not long after I started writing fic myself.
I really don't remember which fic I read first. Probably whichever archive I was reading SS/HG at (adult fanfiction.net and sycophant hex) just snowballed into the rest of the archives. I read *everything* I could get my hands on.
At some point I stumbled across Snarry reader and that in turn led me to LJ and people's journal's and from there the rest is history.
One thing I do know is that Telanu was the first Snarry author I sent a message to, as I'd stayed up until 3 or something reading the Tea Series (to whatever point it was finished in early 2007). So I suppose that must have left an impression on me.