Good Morning, Sunshine

When Five Hargreeves finds himself in the apocalypse, he isn't exactly sure what to do. However, he quickly realizes he isn't alone, and his companion just might hold the key to all his problems.
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This fic is just some sibling bonding that I decided to write because I noticed the plot hole of Klaus being immortal and decided to explore it.

Warnings: allusions to canon-typical deaths, canon-typical substance abuse, mild language.