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@zpanacea gave me the suggestion to write a soulmate fic where Harry's and Louis's souls switch and they wake up in each other's bodies.

Until you find your soulmate the world is in black and white until you meet your soulmate. When you turn 18 a tattoo of your soulmate's first word to you appears on your arm. If you're older than your soulmate you stay 18 until he/she/they catch up.

When Harry wakes up on his 13th birthday he notices two things.
1. The room is in color.
2. The face staring back at him in the mirror isn't his own.

Purely fictional.