Disclaimer: I do not own Merlin or any of the characters. If I did Merlin/Arthur would be canon (well more canon than it totally already is anyway…)
Story: Just some lovey dovey Merlin/Arthur smut? Enjoy M for sex! If you don't like, do not read! Simples!
Arthur's breath hitched as Merlin continued to assault his neck with kisses, fast then slow, his tongue swirling and sliding against the skin. He felt his body twitch and buck unconsciously into the ivory skinned warlock, and his panting breathlessness turned into a soft moan of "Ah!" as Merlin pushed the wet tongue harder against him.
"Tell me," Merlin said unevenly into his ear, "how bad you want it."
Merlin loved talking and while Arthur had never been the vocal type before he had gotten into the whole idea.
"I want it," he said immediately. "I want you, Merlin, so badly," he added, pulling the boy closer to him to emphasise that he needed him to keep kissing his neck like that. "You really…turn me on," he said breathlessly, sliding a hand encouragingly up and down Merlin's back and making him gasp at the sudden touch.
"Ask me," he heard Merlin murmur between applied kisses, a hand smoothing down Arthur's bare chest to stroke, stopping at the lowest point and making Arthur cry out inwardly. "Ask me to keep going."
Arthur swallowed. Merlin was such a tease. But, hell, he loved it. "Please, Merlin," he said, and the need was clear in his words. He had expected Merlin's hand to lower, so was pleasantly surprised when the boy instead proceeded to kiss his way down Arthur's chest, the lightness of the touch making him bite down on his lip with the anticipation.
Finally Merlin tugged down Arthur's trousers, and Arthur heard his brief intake of breath at the state of him – completely erect and swollen, precum gathered at the tip. His breath came faster once more as relief hit feeling a warm wet mouth wrap itself around him, and that tongue begin to flick and swirl around him once more.
"Ohhh, Merlin," he gasped, the sensations skittering wildly through his body as he felt the wet force propelling up and down against him.
"You like that?" Merlin said indistinctly, roughly rubbing his hand up and down the side of Arthur's length before resuming the actions with his tongue, and smiling as Arthur jerked his hips roughly up into the swirling motions of his mouth.
Arthur could hear himself making louder incoherent moans, all he could feel was the incredible suction surrounding him and a warm wetness sliding repeatedly; a pressure that he was sure if he opened his eyes would have him seeing stars. His whole body began to shake as he approached his edge and words flew out his mouth of their own accord.
"Oh, don't stop, please don't –" He let out a final cry as he came, a shudder consuming his entire body.