Based on this fic. Because sometimes my brain thinks its headed in this direction and then it likely isn't:
Someone is love potioned for Merlin.
Merlin: No, I really, I shouldn't, I can't-
Infatuated person: you are the love of my life-
Arthur: Merlin, what the hell is going on? Who is this person, have they lost their mind?
Person: We are destined to be together. You love me back, right? Please kiss me
Merlin: I, I can't, Arthur help me
Arthur: what? You rejecting them? This is your chance to finally get a life
Merlin: you are definitely not helping, Arthur
Arthur: am I so important you can't have a little romance? *teasing with a jealous undertone Merlin can't sense*
Person: Is he the reason? *heartbroken and angry but stepping away*
Merlin: *seizing his chance* yes, yes. That's it. Arthur is the reason
Person: you think HE is your destiny?
Merlin: *pauses* I know, sometimes I can hardly believe it myself.
Arthur: Merlin, what are you doing?
Person: You love HIM? HIM!!!!!
Arthur: Merlin, you're not-
Merlin: Yes, yes, surely that's it. I must be mental. *looks to a red looking Arthur* He rejected me of course, but *theatrically raises hand* the heart wants what the heart wants.
Person: *runs off crying*
Merlin: well that was painful. See you at dinner, Arthur *leaves*
Arthur: *getting redder by the second*
Arthur: *crestfallen* but
Arthur: but I never rejected him