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They were meeting on the rocky outcrop of a small secluded island like they usually did. It was far from prying human eyes, and once they reached the tide pools and the tide retreated, it would be out of the reach of any passing merfolk as well.
It was a bit far from the main shore, but Aziraphale quite enjoyed the boat ride. The sea was calm that day, birds flying in circles overhead, and the water glimmering with the passing of fish that swam under his oar.
He spotted a hint of black and red once he reached the rendez-vous point and smiled. He dragged his boat ashore, and followed the sinuous stretch of tail that led to the beautiful sea serpent waiting for him. He found Crowley reclining in a tide pool, basking in the warmth of the sun, an arm thrown over his face to shield his eyes.
"Hello my dear. I hope I've not kept you waiting long?"
Crowley smiled at the sound of Aziraphale’s voice, as he always did.
"Nah, was busy thinking about you, angel," he answered, reaching out with his hand to take Aziraphale's.
Aziraphale pressed a kiss to it –Crowley’s cheeks tinting with pink– before letting himself be pulled closer. He stood on the edge of the tide pool, the stones warm under his bare feet. Crowley dragged himself out slightly, to be closer, tail splashing about as it spilled out onto the sand speckled rocks.
"You know, your tail on the sand reminds me of a lovely new dish I tried recently. A morsel of fresh eel on rice dipped in a salty sauce. Delectable," Aziraphale sighed happily.
"Eel?" Crowley scoffed. "Do I look like an eel to you?"
"Well, you'd make a rather bigger morsel I should think," Aziraphale teased.
Crowley flashed him a sharp smile. "Between the both of us, you'd think I'd be the one to take a bite out of you."
"Well, you're certainly welcome to, as well."
"You're a menace, you know that?"
He splashed water at Aziraphale who tried to avoid it, but tripped on the wet rocks. Crowley reached out to catch him, his slick skin of no help whatsoever as Aziraphale slipped out of his arms instantly and fell face first in the tide pool. He emerged a moment later, spluttering, wet hair dripping on his face and linen shirt stuck to his skin.
"Oops, sorry angel. Didn't actually mean to drop you."
"Well," Aziraphale said, wiping his eyes of salt water, "it's a good thing I don't particularly care for this outfit." He looked down at himself and giggled, Crowley soon returning his laughter.
"How do I know it wasn't on purpose?" Aziraphale said, poking Crowley's side.
"Wouldn't have tried to catch you, would I? Not that I'm complaining. Good view."
"Hm, complements my own." He waded through the shallow water, and sat astride Crowley's tail, a hand on the serpent's shoulder to steady himself, the other slowly tracing his face. He delicately tucked a piece of the serpent’s frond-like hair behind an ear, already knowing it wouldn't stay in place. Aziraphale's hand traced lower, thumb brushing thin lips and catching briefly on sharp teeth, before caressing Crowley's jaw.
Crowley's tail came up to rest against Aziraphale's back, ensuring he wouldn't slide off accidentally, while his hand reached up, claws catching Aziraphale's collar and tugging slightly. "Hm, how attached to this shirt did you say you were?"
"I am not going back to the mainland with my shirt in strips a second time, Crowley," he chided. "There were enough questions as it was, the first time. Not to mention those about the bite marks."
Crowley dragged a claw over Aziraphale's exposed collarbone. "Well, better take it off fast before I start helping, then."
Aziraphale tutted, but unbuttoned his shirt nonetheless, peeling the fabric away with some difficulty and throwing it on the warm rocks to dry.
"Gorgeous," Crowley said, holding Aziraphale by the waist, the tip of his claws sliding under the edge of his wet breeches.
Aziraphale gasped and pulled Crowley closer, mouthing at his neck, the junction of his shoulders, his collarbone, barely stopping to take a breath now and then. He rocked his hips against Crowley's slippery scales, delighted to hear his moan echoed back to him, as Crowley was just as affected by his attention.
He nipped Crowley under the jaw and Crowley almost growled, before holding him tighter, claws sure to leave marks, and biting hard over the side of Aziraphale's breast, tongue swirling around a nipple.
Aziraphale whined, panting, eyes closed and hips stuttering. He reached between them, searching for the place scales had inevitably parted to reveal soft skin. He hissed in pleasure as he brushed against himself through the thin barrier of fabric on the way, and pressed his hand where Crowley was open and becoming ever slicker, fingers gliding along sensitive edges.
Crowley bit down harder in response, a muffled moan escaping from his lips, the end of his tail slapping the water's surface.
Aziraphale rubbed his fingers harder between them, dipping one inside every so often, his free hand wrapping around Crowley's hair to tug at it sharply.
Crowley shuddered and went still, eyes glazed over. Aziraphale clung to him to get a better grip, moaning out the serpent’s name as his hips ground down harder. He followed Crowley into climax soon after, spilling in the water, panting against slick skin.
They stayed silent for a moment, catching their breath.
"Mmh, fuck," Crowley muttered. "Can taste you in the water."
Aziraphale kissed him.
"Now I can taste you too."
Crowley returned the kiss and nipped his lower lip, careful not to break the skin. "Not exactly the same, is it?"
"Well, I can hardly breathe underwater, can I? But if you get out of it for a moment, I'll see what I can do."
Crowley grinned and kissed him again. "Well, I've definitely no intention of getting in the way of your taste testing, angel."