Great question and a story I never get tired of telling! I'm always blathering talking about how I was in Star Wars fandom for like, yanno, years and years. Slashers were always those people at cons and not me. A gal I worked with kept telling me to read those popular Harry Potter books that Rosie (I used to watch Rosie's talk show every day at work because she did so much B'way stuff) was always talking about but I was reluctant. I mean, kid's books? She--my co-worker, not Rosie O'Donnell--brought the first one into work and just said, Okay try it. So I started the book and it alllllmost put me off. I mean everyone was so meen to Harry. Unhappy about his life, I kept reading. And fell in love. I sorted figured out Snape wasn't the bad guy but I wasn't in love. Not yet. By the second book I really wanted to write Snape fan fic and came up with a couple of stories--don't even ask--and realized that HP fandom was online. Trouble was, I really wasn't. So I got online, learned about yahoo groups and stuff and just generally learned about online fandom.
Out of the blue, one of my Star Wars buds emailed me to catch up and asked what I was into. The weird thing about this is, she and I are the most casual of aquaintances, and have exchanged maaaaybe three emails in ten years or so. So when I say out of the blue, I really mean it. I told her I was into HP and she wrote back that the only fic she knew of was slash and she knew I wasn't into that. I said, what the heck, send me the link. Fate much?
It was the first part of the Tea Series. I think I read it about 47 times. And the second part. I don't think there was a third part yet.
Yeah. Hooked. I started writing a Snarry fic within a week but didn't get brave enough to actually post anything (not that one) (really, I was not brave at all. I had to breathe into a paper bag every time I posted for um, like a couple of years) for a little while after that. It was pretty well-received so I signed up for a fest and have not stopped writing yet. I have some of those early efforts in notebooks and I still dig them out from time to time and read them.