Need a story where Arthur is a ghost who follows Merlin around all day and only in dreams can he communicate and touch Merlin. But to Merlin, he thinks it's not real that he's imagining the Arthur in his mind because no way would Arthur, his golden King would ever call him precious or beautiful, it's just wishful thinking on his part.
So Merlin lives a long life without knowing Arthur is there with him, this time it's Arthur's turn to watch and protect Merlin from the shadows as the warlock once did when Arthur was alive.
Arthur could've stayed in Avalon til he was needed yet the urge to return to Merlin is powerful, although he entrusted the care of Camelot into the hands of Guinevere and Leon he could not do the same of Merlin, and only upon his death did he finally realise why.
He was in love with his best friend. Always had been.
And so it is with great stubbornness and a helpful hand from Freya, whom he just found out was Merlin's first love, he frees himself from Avalon and returns as a spirit that guards Merlin's dreams from nightmares and fights off evil creatures that want Merlin's magic or wish to claim Merlin for themselves...and if some of those creatures happen to be humans who wanted to court Merlin well, he's not going to make it easy on them, on his knight's honour he will protect Merlin's virtue!
