Years after Arthur Pendragon flees King's Landing, he stumbles across a ring that he once gave to Sansa Stark. It brings back memories of his life as a knight in Joffrey's Kingsguard...
Arthur/Sansa always strikes me as a doomed and tragic ship. I suspect that Arthur would be disillusioned by all the backstabbing and scheming at court - and amidst all that treachery, I think that he would be drawn to Sansa's inherent goodness. Sansa desperately needs a nice, non-creepy guy who has her best interests at heart, and I think Arthur fills that role rather well.
I think this may be my most ambitious video ever in terms of plot, so I hope it's clear enough! At the beginning of the video, I tried to imply that there had been a brief fling between Arthur and Cersei. The feelings on Cersei's side never quite die, and eventually they turn into jealousy/hate.
Enjoy!