Merlin Big Bang Rec

Wicked Game by winterstorrm Arthur/Merlin, Merlin/Gwaine, Arthur/Others, Merlin/Others [NC-17] (42k)
Summary: Arthur's the King of Camelot…nightclub. He can pick and choose who he wants, and he does – often – no promises and absolutely no repeats. The night he chooses Merlin might just be his undoing.
With lovely art by savagesnakes

This isn't a fic for everyone. Lots of promiscuity, casual sex and infidelity. Also plenty of heart-wrenching moments with one partner wanting monogamy and the other wanting an open relationship. It’s a really achy, sexy, filthy, deliciously angsty fic. I don’t always like these; in some fics, Arthur can be too cold for me to understand and I end up hating the character and just wishing Merlin with someone else. But this author 'sold' me on this Arthur with all his really fucked up views of relationships and love and sex. While I wanted Merlin to be happy, I also wanted Arthur to be happy too and I actually believed that they could manage that together (when they actually got themselves sorted). And that's what made all the heartache worth it.