Prompt: Maths

"It's simple maths. There are four of us. Now, Arthur can't possibly date his sister and I know neither of you are lesbians so I will have to date Morgana. Which leaves you and Arthur, so you have to go with Arthur."

"I have never heard anything so silly in my life," laughed Gwen as she cleared Merlin's table. "In the first place, why are we going for this fancy charity gala dinner? And secondly, Arthur Pendragon, who mind you I've never met, sounds like the sort of man who can easily get any date he wants."

Merlin sighed. "We are going because Arthur gave us tickets. Look, when else will we get a chance to squeeze into those expensive things we bought for prom night again? I only wore my suit once. I would like to get more use out of it."

"I don't know what world you're living in, Merlin, but prom night was six years ago. Which means your suit, which wasn't exactly on the cutting edge of fashion then, is horribly outdated now. Also, what makes you think we can still fit into those things?"

"I can. I tried it on last night."

Gwen dropped the rag onto the table, looked around to see if anyone else needed her attention, then sat on the chair next to Merlin. "You are up to something."

"As I said, it's simple maths."

"We can go together. After all, if you want to relive prom, that's exactly what we did."

"What about Arthur and Morgana?"

Gwen threw her hands up. "I don't know. They are the famous Pendragon siblings. Everyone would be delighted to be their date."

"Except you," Merlin pointed out while waving his fork at her.

Gwen narrowed her eyes and leaned towards him. "Confess your machiavellian plan or I won't be party to it."

"Alright fine. Arthur is going with Morgana. At least that's the plan but see, Morgana and I -"

Throwing the dirty rag at Merlin, Gwen gasped then laughed. "Oh my god, you're sleeping with Morgana! I knew it! No wonder you've been MIA the past few evenings."

"Shh! I don't need the whole world to know this."

"Miss? Waitress?"

Gwen ignored the customer. Let Susan get him. "Ok so now you and Morgana want to go together and Arthur needs a date."

"Basically."

"Why me?" She turned to the table next to them. "I'm sorry, miss, but would you like to date Arthur Pendragon?"

"Gwen!" hissed Merlin. "Sorry! She's just slightly drunk." He glared at her. "Arthur fancies himself in love with you."

"What?"

"Apparently, I talk glowingly of you all the time."

She raised her eyebrows. "Ooh, tell me more."

"And so he's fascinated by you and he has seen your pictures too. He wants to meet you and Morgana thinks that he'll be less pissed about her ditching him at the last minute if you were his date. He's rich and handsome, Gwen. Plus he thinks you're intriguing."

"Intriguing - like an unsolved murder?" Gwen grinned. "Oh fine. Only because I want to be able to tell my grandchildren one day that I dated Arthur Pendragon."

Merlin laughed in response. "Who knows. Maybe those grandchildren will be yours and his."