iwannabeasnake
Just wanna make something clear, in this AU Aang is aged up to 13 and Zuko is aged down to 15 so the age gap isn't as big.
Also, the cover art isn't mine, I found it on Pinterest-
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Summary:
After entering a network of secret tunnels leading to Omasho, a rockslide separates Aang from his companions. Without a torch, he stumbles around in the dark for hours, until he bumps into an old frenemy. Not knowing what else to do, he decides to stick with the newcomer to see if they could figure something out together.
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Zuko had left his uncle the previous day and hadn't meant to get lost in a bunch of cursed tunnels, but it had rained so hard he'd had to find shelter. Blind from the rain in his eyes, he had stumbled into a cave and the next thing he knew, the exit had vanished. So that left walking in deeper. Little did Zuko know, he would find more in the darkness than the suspected badger moles.