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There were lots of things that were softer than Shanks' back. Boulders, for example; or sea prism stone.
Losing an arm could do that to a man, apparently. That's why Hongo was relieved when he found out he could delegate you to massage Shanks' back. Not that you were an actual physio, but it turned out you were good at relieving him from his back pain and, well, if Hongo could avoid the chief's whining at the rookie's expense, he wouldn't hesitate for one second.
So you ended up on captain's back-pain-relief duty instead of evening deck-scrubbing duty which, to be honest, was a win for you as well.
Now, this had been a long day for the whole crew: a particularly nasty fight against a Marine battleship that had left everyone quite sore, particularly your captain. Night was falling on the ocean and you were stretching your own aching arms as Shanks was taking his shirt off and lying on his front on the bed that he almost never slept in - he insisted he can't have better sleeping arrangements than his crew. 'It doesn't feel right, even if I'm the captain', he would whine.
"I'm gonna start with your shoulders, chief. I'll have to sit on your ass to work, though," you said. "Go on," he hummed, smiling at your antics.
You started kneading at Shanks' shoulders until they relaxed, your thumbs pressing circles between his shoulder blades. His breathing relaxed as you worked, and the two of you made easy conversation until you moved your fingers to his spine. Then, a soft moan cut him mid-sentence, and as much as you tried to ignore it and resumed talking, you couldn't help but feel your face get hotter. You had always found him attractive, after all. As you massaged his side - where he missed his arm - his breathing was getting heavier; he had stopped talking soon after he had moaned at your ministrations.
You knew it wasn't because he was ashamed of it, because this man had no shame in him really, and you didn't dare question it. After all, you had to concentrate very hard and very deliberately on what you were doing to stop your own thoughts from racing after that. Fuck, the captain could let out such hot sounds, you hoped he couldn't feel your arousal against him.
When you moved to his other side though, he caught your hands with his, effectively stopping you.
"Hey..." he sighed, turning his head to look at you, "your hands feel really, really good."
You flushed even more at that, and in a moment of inattention he turned himself on his back from under you. Your mouth went dry, unlike your underwear, which was getting more and more damp as you were getting physical contact with Shanks.
"I can feel that you know," he chuckled, "not that I'm any better."
He looked at where you were sitting and, yeah, you could feel that too. You let out a breathy "oh" as Shanks let go of your hands.The captain then looked at you expectantly, but he was still leaving you an out if you didn't want this to go any further.
And while you could have, you didn't want to. You took his hand in yours and guided it to your hip as you descended your mouth on his. The kiss started gentle, but it quickly got filthy, all tongue as you ground your hips on Shanks', spurred on even more by the delicious groans he was letting out. Your hands roamed his chest, petting the hair there, your fingers catching on his nipples from time to time, having him hiss a little in pleasure. Soon, your hands went down his toned abs to palm his clothed erection.
The sound of your panting filled the room as you rid each other of your clothes, his only hand showing skill at undoing button after button on your shirt, then pants. Shanks pinned you to the bed and attacked your neck and shoulder with no mercy, as if intent on marking you with his lips and teeth.
"Chief..." you whimpered as he sucked at the skin below your ear. Your legs wrapped themselves around his hips and his cock caught on your hole, leaving both of you moaning at that.
"Tell me you want it," he murmured in your ear. Fuck, his voice was filled with desire, you couldn't help but comply:
"Please, chief, Shanks! I need you!"
He didn't wait a second, entering you with a deep moan. You were sucking him in so eagerly, making filthy moans and whimpers just for him. After a few slow thrusts to test the waters, he sat up on his knees, joints popping but not caring about it as he manoeuvred one of your legs over his shoulder, the other following when you understood where this was going. He started at a pace that was just the right amount of rough, still passionate and oh-so-hot, but deep and strong at the same time. It was a symphony of sighs, moans deep and high and skin slapping skin that accompanied your shared pleasure. On the verge of release though, you needed more. Your legs went down around his hips once again as your hand slid up Shanks' arm and gently tugged at it, wordlessly hinting at him to get closer to you.
In a push of both your hips and your hand on his shoulder, you reversed positions and tugged him up to you again; his hand found its place under you as both of yours went around his neck. You could tell he wasn't going to last much longer himself, his moans getting deeper and more ragged. He once again brought his lips to your shoulder and bit it harshly, and it was what undid you completely. You tensed up and moaned loudly, a sound that Shanks swallowed greedily as he crashed his lips to yours, your hole milking him dry and bringing his own orgasm. He roughly bucked his hips against yours as he filled you with his seed, effectively leaving you to ride both of your highs.
You fell boneless into the sheets, him following suit, his only arm wrapping around your waist. With tired eyes, he laughed:
"You're never leaving massage duty now, you know that?"