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He'd been waiting for months for Someone, Anyone to ask if he'd go to prom with them, yet here he was on that very night alone. Watching crappy TV and eating his feelings away with ice cream, it wasn't a suprise if he was being honest. He wasn't popular in any way, shape or form but he'd thought that someone would at least have asked!
Just as he really got into moping, a knock at the door sounded taking him by suprise. Most, if not all of his friends were either getting ready for or were already at prom so he had no idea who it could possibly be, with a quiet groan he paused what was on and made his way to the door, already feeling confused when a familiar head of blond hair could be seen through the frosted glass.
Of course it was him, why wouldn't it be? With another huff of annoyance Merlin opened the door, "come to gloat have we?" He asks with a roll of the eyes, but stops himself from saying anything further when he notices that Arthur was not only wearing a very well made tux, but was holding another one by his side, not only that but he had a few balloons that said 'Prom?' and 'Prom!' respectively.
Making a noise of confusion, Merlin finally made eye contact with Arthur. Who to his suprise was looking slightly nervous, which Merlin wasn't used to seeing and became confused and concerned "Merlin Emrys, I know we don't talk much if at all, but there's something about you that I can't quite put my finger on and I would really like to get to know you better" he starts, taking Merlin off guard as Arthur only ever talks to him if he's taking the piss out of him, Arthur Pendragon LIKED HIM?!
Taking Merlin's stunned silence as a sign to continue, Arthur fidgets slightly as nervousness takes over his voice "you don't have to accept and I'm not asking out of pity or whatever it is you might think" he continues, which is when Merlin picks up on what this is about and he can't help the building hope that he feels growing in his heart "would you go to prom with me?" Arthur finally asks, moving from foot to foot as he looks at everything but Merlin, so misses the way his entire face lights up, but looks at him in time to see a bright but fond smile on his face, looks like Arthur Pendragon isn't a dick after all.
They look at each other for several seconds, neither saying a word before Merlin rolls his eyes "hell yes I will!" He says, bouncing slightly in his excitement, which causes Arthur to chuckle slightly as he holds out the tux for him to take "thought I'd be prepared in case you didn't have one" he explains, watching as Merlin's eyes slowly grow wider before taking it and rushing upstairs with an excited laugh.
It only takes a few minutes to change, but by the time Merlin is dressed in a tux that fits him rather too well, he comes back down stairs to find Arthur lounging on his couch "you might have had a good idea" Arthur mutters when he hears merlin enter the room, only to turn and do a double take, letting out a low whistle that has Merlin blushing madly. Just before they leave Arthur stops him in the doorway with a quick "wait!" And redoes Merlin's tie, causing Merlin to hold his breath due how close they were to one another.
When they do eventually make it to prom, Merlin suddenly becomes nervous. This was the biggest night of their lives and he was wearing the most expensive thing he'd ever seen before "shall we?" Arthur asks, holding out his arm with a look of concern at the fact that Merlin had gone extremely still for no apparent reason "we shall" he answers in kind, wrapping his arm around Arthur's and as soon as they walk in, its as if the entire room has their eyes on him and he can't help but blush once again.
Arthur must notice his discomfort because he chuckled quietly, "ignore them, they're just jealous" he says softly, which makes Merlin's confidence soar for a few seconds. People were jealous of him, Merlin Emrys, for getting a prom date with Arthur Pendragon, his night had just gotten even better! He some how ended up on a table filled with his friends, every single one of them turning to him with excitement and disbelief as to how the hell he'd managed to get here with the guy he had.
In the end it was one of the most memorable nights he'd ever experienced, one he wasn't going to forget for as long as he lived.