cannon is not necessary when writing an au
We all know the "everyone loves Merlin" and "everyone ships merthur" trope almost always work together...
Now imagine... The people love Merlin but don't think Prince Arthur, or Prince pratt, as they call him behind his back since Merlin started it, deserves him.
They do notice that Arthur is fond of Merlin... But to have the prince seduce their favorite servant? Have him hold his power over the poor manservant with twice the jobs he should normally have?
Hell no.
Give me protective Camelot. Give me Camelot citizens who constantly try to cockblock Arthur on purpose.
Also, jealous Arthur, as a treat.
Modern AU concept:
*grindr notifcation goes off*
Merlin: Arthur ... Why are you on grindr?
Arthur: Well, you said that I would return when Albion's need is greatest. But I can't do it on my own, so I thought I'll go and recruit some knights. And in the app description it says that you can find men on this app.
Merlin: ...
Merlin: okay then, carry on.
Bonus 1:
Arthur: MERLIN!!!!
Merlin: yes, Arthur?
Arthur: why do all these men want to bed me?!?!?!
Merlin: because it's a dating app. I told you about those
Arthur: oh... Wait, then why did you recognise the notification sound?
Merlin: ...
Arthur: Are you bedding men?
Merlin: I do have a life outside of you.
Arthur: *hurrying to open his phone*
*grindr sound goes off again on Merlin's phone this time.
Merlin: did you just match me?
Arthur: you can't have a life outside of me. I am everywhere.
Bonus 2: *weeks later*
Grindr sound goes off again.
Arthur: holy shit, I think I found Gwaine!!!
bbc merlin - 03x04 Gwaine
the way arthur doesn't push as much as he just shoulder bumps merlin, the way merlin starts running before arthur even makes a move, the way arthur only runs about three steps before stopping. intricate rituals etc etc.