It's Friday, I'm in Love - High School Musical; Chad/Ryan. I love this fic. I spend hours searching for this fic because I forgot to save the link.
Some Kind of Fairytale - Percy Jackson; Percy/Luke; human'au. I recced this last year but I have to rec it again.
Need You Wild - Bandom; Spencer/Brendon; werewolf'au. This one isn't a small fandom and it's decently popular but I had to rec this because I read this fic before I even knew who these people were. I knew of patd musically wise but I couldn't tell you of anyone who was actually in it. All I knew was that it was gay werewolves and really long. I loved it and it was the fic that got me into patd as a fandom.
Growing Pains - Young Dracula; Vlad/Robin; Coming of Age. I'm going to admit something. I've only seen season 1 and part of season 2 for this series. But it's still so epic that I slashed them from episode 1.