At first I didn't really like this pair, but after thinking about it and reading some amazing fanfics, I really love this pair. I still really really love sev and lily-the fact that he still loves her after all those years, and that she was his entire reason for living, but as for AU, or what would have happened if severus didn't die that night in the shriking shack, I think sev and hermione makes sense. One of thie things tat attracts me to this pais, is that it means that severus gets a second chance at love, and that the issues he has, e.g. not letting people get close to him, being insecure, can get addressed, and hermione can love him and help him through that. It also means that severus gets to experience loving someone, and that someone loves him back. From hermiones perpective, I think her and severus suit eachother, they have a compatable intellectual level, I ferel that she'd be really drawn to him. On fanfiction there are a lot of crap stories about them, but I've managed to find some amazing ones that are incredible, which i'm reading now. I'll put links to them below;
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at the moment i like the story I linked first best, it's called lessons in love.