[One more chapter after this]
The moment passes and Jim is sliding off of him again, and once more his wrist is freed only long enough for him to turn back over onto his stomach. Jim's body is pressed against his back and his lips are at Sebastian's neck, biting hard enough that the skin threatens to break under the pressure. Sebastian lets out a low groan and tilts his head, giving all of his neck to Jim, completely submissive in the act.
"I love the way you move under me," Jim says, "did I ever tell you that?" He presses his lips to the back of Sebastian's neck and starts to lick his way down the older man's spine. "The way your muscles shift under your skin while I'm fucking you, the way you push back against me, needy and desperate, it's rather lovely sometimes."
Sebastian lets out a low whine and pushes back, prompting a low chuckle from Jim. "Such a good boy." He nips lightly at the skin below one shoulder blade. "But what I enjoy the most is the way you hurt for me." Lightening quick, Jim's arms snake around Sebastian's torso, the fingers of one hand pressing hard into the letters carved into his chest, while the others dug into the knife wound on his side. Sebastian cries out, pushing desperately against Jim's hands, wanting, needing the pain. The pain is Jim's mark of ownership, Jim's twisted way of showing affection and Sebastian craves every moment of it.
Somehow while Sebastian is lost in a haze of pain tinged with lust, Jim has done away with his pyjamas and is pressing back against him, hard cock pushing into him, stretching him, filling him, and god, it's good. Sebastian's fingers tighten against the headboard, the knuckles of his hands turning white with the force. Jim isn't moving, just buried deep inside of him while his tongue traces intricate patterns across the old scars marring Sebastian's skin.
He wiggles a bit and rocks himself back against Jim again, only to get Jim's palm hard against his arse for his trouble. "Not yet." Jim tells him, but that just makes him want to do it again, makes Jim strike him again.
Jim's hands slide of Sebastian's side, fingers pressing and teasing across the whip marks, and slide up his arms. His hands cover Sebastian's on the headboard and he squeezes lightly as he leans forward over Sebastian's shoulder to nuzzle against the side of his face.
"The noises you make are delightful, Bastian." He says. "Let me hear you." Jim bucks his hips hard and grins into Sebastian's skin at the sound he tears from the man. "So pretty." He bites sharply at Sebastian's ear lobe. "But I want you to be louder." He drags his tongue around the shell of Sebastian's ear. Let me hear you." Jim's hips roll forward, slow and strong, pulling almost entirely free from Sebastian before burying himself again completely.
Sebastian twists his head to one side, seeking contact from Jim as he moans out his boss's name, low and hungry, desperately seeking more. "Jim….Jim, fuck, please"
Jim's pace quickens, panting against Sebastian's neck, hands tightening almost painfully over his. "Please what?"
"Harder. Please, harder. I need, fuck…more. Please"
"Well if you're asking so nicely." Jim bites down roughly on Sebastian's neck, the skin breaking beneath his teeth as his hips slam forward, pounding into him, hard and fast. One hand releases Sebastian's and wraps around his torso, seeking out the bleeding letters and pressing his nails into them, snarling "Mine."
Beneath him, Sebastian is a whimpering, writhing mess, barely able to gasp out, "Yes, yours, only yours, more, Jim."
The hand slips from his chest and wraps around Sebastian's painfully hard cock and he can barely breathe, everything just feels too good, too right, too perfect. Jim is the only thing he's aware of, touching him, wrapped around him, in him, and it's almost too much to handle.
He can feel Jim's movements becoming jerkier and knows that he's just as close to falling apart. He twists his head to see Jim's face, but then Jim is kissing him, licking his teeth and stroking his tongue and it's too much, he's coming undone completely, groaning his boss's name into the man's mouth as he orgasms in his fist.
He feels like he might pass out and then he can feel Jim shaking over him, letting out a half-strangled, wordless cry as he comes, buried deep inside of Sebastian's body. Sebastian thinks it might be the best thing he's ever felt.