Okay, so Connor x Evan is one of those ships where you have to dig through a mountain of oneshots to find the truly developed stuff. The absolute standout for me is 'The Way The Light Reflects' on AO3. It takes the 'Evan writes letters to himself' premise and flips it into Connor finding them, but instead of it being a quick fix, it's this painfully slow exploration of two deeply broken kids trying to figure out if they can be each other's life raft. The author nails Connor's sharp, volatile edges and Evan's quiet, spiraling anxiety without ever making them caricatures.
What I love is that it doesn't shy away from the mess. There's no magical cure for their depression, just these small, hard-won moments of connection that feel real. The prose has this aching quality to it, especially in the quieter scenes. It's been a few years since I read it, but I still think about the image of them sharing headphones on the Murphy's roof, not talking, just existing together in the dark.