Work Text:
Two months after Merlin woke up from his unresponsive state brought Arthur and Merlin into Arthur's bed. Naked.
Arthur slowly tore his eyes from Merlin's nipples to look down.
Fuck. Merlin had a vagina.
Arthur glanced up to Merlin's eyes for permission and after a moment, he gained a small nod. Arthur locked lips with Merlin and explored his mouth, his fingers trailed lower and lower until they reached Merlin's pussy. He rubbed it with his fingers, getting it wet and Merlin bucking into him. Arthur, overcome with lust and the urge to fuck Merlin stupid, thrust two fingers into Merlin's hole then brought them out before going bake in. Over and over.
"Come on Merlin. Don' you want to have me in you?", Arthur's eyes darkened, "Want to take me in one go." Arthur squeezed in his other three fingers.
"A-Arthur please. Put it in me. Fuck me s-so good, Sire! Ah ah ah ah." Arthur slowly pushed through Merlin's hole until he had his whole forearm inside.
Merlin threw his head back and moaned. His back arched away from the crumpled sheets. Merlin brought his fingers to his nipples, he rolled and pinched them for what felt like only moments before they were slapped away and replaced by Arthur's mouth. Merlin wailed from the amount of stimulation he was receiving. Arthur's hot mouth sucking and biting his swollen red buds. Arthur's clenched fist thrusting in and out and in and out. It was too big He was so full, oh God he was so full. He was going to cum.
"Go on Merlin," Arthur growled, "Cum like the slut you are, my little whore. You're going to be wonderfully tight I just know it."
Merlin trembled as his orgasm tore through his flushed body and went limp.
Arthur took his hand from Merlin's pussy and brought it to Merlin's mouth, "Clean." And Merlin did just that, when he had finished sucking his juice and cum off from Arthur's hand, he made to sit up.
Slap.
Arthur began spanking Merlin's trembling pussy. "You didn't think we were done slut, did you?"
Slap.
"What about me, a slut like you should know better."
"I-"
Slap.
:Whores like you don't get to talk to me. The only thing you're for is to get me off." And with that, Arthur thrusted in all the way without warning. "Oh God how are you still so tight-fuck!"
Arthur flipped them around so that Arthur's back was now on the bed and Merlin was straddling him. He lifted Merlin up and down, his small tits bouncing as he was fucked at a brutally fast pace. Lewd sounds came from full, swollen lips, "Ah ah ah Arthur please I'll be good don't-don't stop sire!"
Arthur kept up his pace despite the loud moans and wails-"Stop please stop" and "Don't stop don't don't stop." His pace quickened after a few minutes, thrusting his entire cock into Merlin's pussy, he came.
This time, thought Merlin, we're definitely done.
It was the early hours of the morning.
Arthur had cum for the umpteenth time. Merlin's stomach was slightly bloated, it looked like he was a month or two pregnant. Except, he wasn't-only filled with Arthur's cum. It spurted out of him when Arthur took his cock out of him, Arthur took the excess cum and started slathering it all over Merlin's body-paying extra attention to his tits and face. Arthur lay his hands on Merlin's waist and looked at his face.
Merlin's usually bright and vivid eyes were half-closed and glazed over, his full lips were parted slightly and, not on to miss an opportunity, Arthur locked lips with him. Merlin's high, sharp cheekbones were decorated with strings of both Arthur's and merlin's cum.
"I wish I could paint a picture of you like this," Arthur's voice was soft now, "But no one's allowed to see you like this but me."
Merlin's eyes glowed gold and the mess they had made vanished. Their bodies, their clothes, and the bed were fresh once again. merlin sat up and flashed his eyes, now there were several rolled pieces of parchment. Arthur rolled them out and his eyes widened, he checked the other rolls and yes. they were painting of them in various stages of sex. Arthur rolled them up and set them aside.
Plot:
"I'm glad I finally have you," grinned Arthur, "And I'll have you for the rest of my life. I-If you're agreeable of course."
"W-What? I thought this was a one time thing," Merlin's eyes filled with tears, "Why else would you call me those things?"
"Merlin!" Arthur looked horrified, "I didn't mean any of those things my love, you're the most kind self-less person I'll ever know. Oh love. Okay. Okay, I'll never say or do those things again. We'll figure it out later."
"Promise?"
"Promise."