I love this! I came into Snape fandom in 2006 after a major obsession with the film V for Vendetta got me online. I noticed I had a long simmering lust for another dark haired anti-hero.
I listened to Snapecast and heard about fanfic and pairings, and heard Rachel (chaeche) say the word "snarrrry" my toes curled and my hair stood on end and I knew I had to run and get some. I was intrigued/horrifed by the whole idea, but the thrill quickly outran the squick.
My first Snarry was A Bittersweet Potion by Alchemia Dent & Bugland.(www.intertexius.com) it's a long angsty WIP that is not currently updating now, but I highly recommend the first three books as classic, brilliant SS/HP, where a self-loathing Severus gets close to cat-animagus!Harry, and Harry discovers his emerging sexuality. It was funny, hot, angsty and I couldn't put it down, much less get it out of my head. Its as if I fell in love with the pair, like I would with a person. This love is still intense three years later. Who can explain such magic?!