Karl was an avid fan of romantic tropes, more specifically: the red string of fate. Key word: was. His hopes were lost at the ripe age of 20, accepting the fact that the string might not be real, until he's met someone.

Karlwastaken hogwarts AU Karls a huffelpuff dreams a Slytherin their both in their 6th year

The villains just have more fun, baby.

I love you just seems more dear, doesn't it?