Oh Gods I can't remember my first Snarry!!! *runs around like a headless chicken*
But I'll tell you a story about it :)
When the first HP books came out various friends tried to get me to read it, I was at the time (circa 1999-2004) deep into my LOTR obsession that I didn't not see/read/watch anything else! Dude, I had LOTR what more did I want? Of course it didn't help that all the people that tried to pimp the stories to me where not slashers (well maybe one or two of them were) and kept telling me "but it has magic! and a young boy!", I was like: "why would that interest me?" I was of course by that time neck deep into various fandoms and I kept seeing people mentioning HP and Harry/Draco, but still it was not enough. Due to how pushy (the wrong kind of pushy) some of my friends were I ended up hating Harry Potter and everything it stood for! I did not want to read it or watch or have anything to do with it!!
I relocated from the UK to Greece in spring of 2005, I got a job for the summer and then I went into unemployment for the winter months (I live on an island and most of the hotels work only during spring/summer) and having just bought a car I was horribly broke, so I was staying at home and not doing much. My oldest BFF decided to take matter into her own hands and send me her HP books, just in case...
I read the first 6 books in 5 days during Xmas holidays of 2005. It took me something like 2 weeks to decide that I needed to find slash about it. I think that my first foray into HP slash was around January 1st 2006, quite possibly on AFF and then the Fuq-Fests on kardasi.com and then Resticted Section.
My pairing of choice? Snape/Harry. Snarry was my first pairing and still my most favorite one (although am a whore for Snape/almost anyone or you know Snape/Kingsley, Snape/Bill, Snape/Charlie and occasionally Snupin). I found the comms on LJ quick enough and started reading fic. Funnily enough I became a member of pornish_pixies around the time of the big strike through and I followed fandom to Insanejournal where I made some wonderful friends that I still annoy from time to time!
So remember those friends that kept trying to interest me in HP like a decade ago? Imagine how they reacted when I told them that I read the books and within one week of that I was reading Snape/Harry slash.... MWAHAHAHAHAHAHAHAHA!!! It was not my fault that I read the books and came away with that pairing! LOL
I've been a fan of May/December pairings for a long time (thank you TPM) and a slasher for longer, so really very few things in the Snarry fandom shocked me or made me feel like a weirdo, that's always a plus :)