Title: The One With the Sleepwalking
Pairing: Merlin/Arthur
Warnings: dub-con

Arthur is woken by creaking as the heavy door to his chambers opens slowly. He holds his breath and listens for the intruder, aware of every tiny sound in the pressing darkness. He hears the brush of bare feet on flagstones and the swish of gentle breathing.

A figure approaches his bed. It is Merlin, wearing only a thin nightshirt. The moonlight that pours through the casement window makes his pale skin gleam and his hair curls black around his shadowed face. Arthur shivers as he realises that Merlin is asleep, his eyes are wide open but unseeing, his full lips slightly parted, his face expressionless and strangely blank.

"Merlin," Arthur whispers.

At the sound of his voice, Merlin's face breaks into a smile and he moves closer.

"Merlin," Arthur tries again gently, fearful of startling the boy. "You should return to your chambers."

Merlin crawls into the bed, pulling the sheets over them both. He curls himself around Arthur and slides a cool, slender hand onto Arthur's chest. His fingers caress the hair there. He hums gently, a warm, contented little sound as his eyes flutter closed and his breathing slows and steadies.

Arthur lies frozen, the scent of Merlin filling his nostrils. His heart is pounding and his cock is suddenly, inexplicably hard and straining against his leggings. He lies awake for what feels like hours, tense with arousal and something a little like fear.

They are swimming and Merlin dives deep. Time stretches out and Arthur is afraid. He plunges down into the dark water, feeling for Merlin with outstretched hands. When Arthur pulls him back to the surface, Merlin smiles into his eyes and wraps warm limbs around him. Their bodies meld together. Merlin licks his mouth open with an insistent tongue and Arthur feels as though he is the one who is drowning.

He wakes with a gasp and finds that Merlin is draped over him. Their legs are in a hot sweaty tangle and Merlin's arms are wound around Arthur's neck. Their erections are pressed together and Merlin is moving his hips in tiny restless circles that make Arthur burn with desire and shame. Arthur resists, pushing at Merlin's shoulders, but Merlin presses his face into Arthur's neck and sucks at his skin.

Arthur flips them over and pins Merlin's wrists to the mattress, needing to see his face. Sure enough, Merlin's eyes are open, but glassy and unfocused. Arthur is about to move away from him, but Merlin bucks his hips and whimpers, a small strangled sound of desire. The outline of his prick is clearly visible through the thin cotton of his nightshirt and Arthur can see the head, pressing wet against the fabric.

"Arthur... please..." Merlin begs, twisting like a fish in Arthur's grip and Arthur is lost. He lowers his hips and ruts against Merlin in a frantic, desperate rhythm. His orgasm shocks him with its suddenness and intensity, crashing through him like a breaking wave. His hips stutter as he spills hot and wet in his clothes, his cock untouched.

Merlin is still lying beneath him – prick hard and hips jerking. Without conscious thought, Arthur moves to kneel between Merlin's thighs and pushes his nightshirt up. Merlin's cock juts from its nest of black curls, lying flat against his concave belly.

Arthur dips his head and sucks the tip into his mouth, tasting musk and seawater. He feels Merlin's hand tangle in his hair and hears him gasp. Arthur sucks hard, taking in as much as he can. He tongues and licks as his lips slide, acting on instinct as Merlin keens and twists his fingers painfully in Arthur's hair. With a cry that is more animal than human, Merlin arches, pushing deep into Arthur's throat. Arthur tastes hot salty bitterness and swallows it down.

When he pulls away, panting, Merlin is lying beneath him. Merlin's eyes are closed, his face relaxed in sleep, body limp and spent. Arthur rearranges Merlin's nightshirt and lies back down beside him. He touches his lips lightly to Merlin's temple, and breathes him in.

Merlin swims away from him, heading for the shore. Arthur watches as he wades through the shallows, water trickling in bright trails down his sunlit body. Merlin turns and waves, slips into the trees at the shoreline and is gone. Arthur's chest aches with the loss.

When Arthur wakes in the morning, he is alone.

A/N: I hope you liked it. This is the last of my pornathon entries for this year. I really enjoyed writing them and might get round to expanding some of them eventually. If you've enjoyed reading them please check out my other fics. There is more Merlin/Arthur and I also write Harry Potter and Twilight slash fic.

Thanks for reading x