Flying-spark - I Don't Know What I'm Doing

Au where everything is the exact same, but in the first episode merlin is hired as Arthur’s secret bodyguard. It changes nothing except that he gets paid to deal with all that shit, and he narrates each episode, but gives a wildly different account of what is happening on screen, and at the end it cuts to Merlin explaining to Leon what happened, and why he should get overtime pay

Danny Phantom but they’re demon slayers

Love potion au.

Merlin is drugged by a love potion and grows increasingly affectionate with Arthur.

Arthur doesn't think anything by it and just lets it happen, because it's Merlin and Merlin always does whatever he wants.

Time skip of two months.

Arthur is sitting with his father at court, Merlin chilling in his lap.

Uther: son... Could you... Send your servant away?

Arthur: ??? But it's Merlin

Uther: he's very clingy. This isn't seeming for a future king

Arthur: well, it's not like I know what normal human interaction looks like, since someone forgot to tell me.

Uther: put him down

Arthur: why? He's not doing anything wrong!

Uther: son, you must be under a love potion

And that's when drugged Merlin panics and tries to find the antidote. Only to test it on himself and breaking the spell on accident.

You know the Grimm version of Snow White makes more sense than most versions if only because in that version Snow White was like 7 years old.