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Arthur doesn’t think there’s any way he could have been prepared for this. He doesn’t even fully remember saying yes to it, just nodding fast and desperate because anything Merlin whispers in the quiet safety of their bed is sure to be a great idea. But now, with Merlin’s mouth teasing at the most private spot possible, Arthur is helpless to do anything but hold on for the ride.
Merlin’s tongue is quick and deft where it licks at his hole, and it’s downright filthy but sends a sharp spike of need straight through him. He has no idea why it feels so good, but it’s making him fall apart in the best ways.
“You’re so sensitive down here, Arthur.” Merlin’s voice is pitched low, rough from arousal, and the fact of Merlin being just as affected by this is intoxicating. “This is gonna be so much more fun than I thought.”
“Oh Gods, Merlin,” Arthur whines into the pillows underneath him. “Please.” He’s not even sure what he’s pleading for, just that he needs more of this, and soon.
Merlin shushes him and goes back to softly kissing his way around Arthur’s entrance. “It’s alright, I’ve got you. Just try to stay still for me?” With that, he doubles his efforts, and Arthur proceeds to fully lose his mind.