Standard stuff: Black Butler is not owned by me. OC is. I borrow all the characters and smash them and put them back. Nothing is meant to reflect anyone's work - entirely my own wicked minds' creation. If it resembles another work, I honestly have not read much else out there in this vain. Typos are mine...

This is a work of Smut. Lots of swear words. Smut. Plot is in there... honest. First Black Butler Smut fic, so be nice. Please. I haven't posted any of my writings in a very long time, so I am opening my world to you, respect, ya?

OC x Sebastian Michaelis, later Grell x William

Rated: M/MA

Ok, so on with Chapter 1: Hearts Exploding

"I don't need more blood on my floor," she hissed, watching the bloody knife slip out of his hands and begin the decent to the hardwood floor. The area around them was already washed in blood splatter. He quirked his lip into a smirk, watching as she, faster than a human could ever move, grab the knife mid-fall and stop in front of him, knife positioned perfectly at his throat.

"I will remember that, my dear," he said. He watched as her silver eyes flashed and settled back into the solid grey of her normal being, bringing his blood soiled white gloved left hand up to gently nudge the knife away, his own fuchsia and then red tinged eyes, never leaving hers.

"You forget so easily," she whispered, drawing her lips ever closer to his. The cat and mouse, demon and angel, sex and danger, game was just as fun as when they were sitting on opposite sides of a soul, as it was when they were tangled in bed together. And these days they found themselves more in the later than the former, something neither minded.

"I am a forgetful man," he muttered as he lowered his lips to hers and sucked her breath as quickly as she did his. They were locked in a kiss, which really they could have continued into eternity, since neither needed to breath to continue existing. He found her hands were snaking past his topcoat, into his vest, and down into his pants. He growled as his own hands found her ass and pushed her closer to him. Her hands did not pause as soon his pants came undone and he felt his cock being touched again.

"Let me remind you," she whispered, slowly leaving his mouth and slithering down his body. He watched through long lashes as her mouth now reclaimed his cock and she quickly brought him to full hardness, not a hard task for the half angel, and full lover of one demon. She really was a demon's dream.

"Fuck," he hissed, loosing his form and letting his demonic wings unfold. He threw his head back and moaned, his eyes flickering in the low light and took in how the blood of their previous hunt was clearly all over the room, some not seen by human eyes. He looked back down and saw she had also lost part of her form and her shimmering angelic wings were protecting her naked body from his hungry eyes.

He hooked his hands under her arms and picked her up, effortlessly placing her firmly against the settee and sliding his hard cock into her, now watching her eyes flutter close and her perk breasts bounce as he thrusted her into the velvet fabric. His demonic cock grew as he pushed deeper into her and her body also shifted to give him the fuller breasts of his bed mate, her true form of angel and demon, taking his demonic cock and body steadily as they had done many times over the past months.

"Fuck me harder Michaelis," she panted, gripping his shoulders and sinking her fingers into his half flesh, half sulfuric vapor. "You made those men bleed on the floor - the one I spend time washing."

"Should I not be the one being punished then?" he asked, his wicked smile, all sharp teeth and wide angles, settling on her throat. "Not that I mind being told what to do."

"You are such a good butler, aren't you? Waiting, half starved, to kill and eat a soul, making yourself almost delirious with lust for a soul."

"Why should that matter? You do the same."

"Oh!" She flipped them around so they were on the floor, his back now in the blood she had mentioned, her breasts now bouncing violently in time with her riding his cock. "I put my mark on men who wish to do great things in this world."

"As do I - I just like them a bit naughty," he said, watching openly as her tits bounced. "I like mine really nasty and corrupted."

"Like the angel on your demonic cock?"

"Especially that one."

The two settled into the vicious toying of rough sex, the kind that would break mortal humans, but seemed to be the only way to satisfy the particular immortals who engaged in the act currently. They had both branched out and had their own kind to bed, but the act of making a house shudder, an angel and a demon scream, and having them curl up naked as they slowly fucked once more, was only something that Michealis had found Katherine could do for and with him, and she, him.

"I hate how I need you," she whispered as she pitched forward and slammed hard on his cock and looked into his eyes.

In an instant they were both their human forms. He moved his left hand, still gloved, to his mouth and pulled it off, revealing his marked hand and black nails. His eyes never weaved off hers as he did the same to his right hand, and spat the gloves across the room. He reached up and shoved his hands into her curly red-brown hair and pulled her slowly closer to his face. Their kiss was gentle and belied the intensity of their bodily needs.

"For centuries I have needed you - and taken you - as well," he said, placing her head on his shoulder as he slowly thrust into her body. "Not just your warm body and soul - both of which I have. But your soul is the only one I have marked and will never consume."

Her arms glowed; her left snaked around his head and her right hand rested on his chest. Her mark of angelic wings and a halo glowed on her right forearm and he felt her mark burn on his own chest. "And your heart the only one I will not take."

"No wonder the others of our kind avoid us - we never fit in."

Katherine sat up and looked down at him for a moment before shifting back hard on his cock and smiling. "But we fit together."

"You demon," Michaelis hissed, once more pinning her to the floor and once more drawing her legs up to his side and sliding deeper. "You only look like an angel."

"And you only look like a scary demon when you are wanting to make deals with little kids," she countered. Throwing back her head she laughed. "Pervert!"

"Heart breaker," he growled.

"Dog."

"Woof."

Katherine screamed her release as she slammed her body into his and Michaelis did the same a moment later.

Michaelis woke to Katherine sitting on the chair, looking down at him. She had her angelic lace gown on and her head leaning in her right hand, studying him as he sat up. "A job?"

She nodded. "A heart that will not explode this time," she said, looking around the room. "Honestly, I need to vet these hearts better if the Reapers even have a slight notion that this is theirs, well," she paused and made a waving gesture with her hands. Sitting back she leaned her head back and sighed. "I can not ask you to come and help every time. You would think the red haired one would know better by now."

She flashed a smile at Michaelis as he sat up beside her, the angelic mark on his chest glowing a bit. He huffed and flashed her his left hand, making his own mark on her left forearm sizzle. She leaned over and kissed him gently, pulling back and letting her eyes take in the tight, naked body of her centuries old lover, and supposed to be enemy. Their world was split between Hell and Heaven, Demons taking souls to survive and Angels guiding them to glory. The Reapers rested in between, hating both sides, but loathing Demons for their continuous lust to steal souls - no matter if they were marked or not. Michaelis was one who had stolen his fare share of souls but had quickly shifted to cultivating them to make better meals after he met Katherine - a halfling of a half-demon and fallen angel - and taught her to devour souls, not just bring them to a holy end, as well.

"You are staring at me," he said flatly, although she was staring back at him; her dress could be easily taken off if he wished.

"I am waiting on what we should do next."

"I have to get back to Phantomhive. If I don't come with tea and biscuits, his attitude is even shittier than normal," he said, sitting back into the chair and sighing. "I honestly should just devour the brat and make sure to distract you."

Katherine quickly was straddling his lap, his cock trapped beneath the layers of fabric of her dress, yet aching for the reward hidden. She laid her head on his shoulder like she had done after their last orgasm had satisfied them for the time being. She kissed his neck slowly and teasingly before sitting back and smiling at him.

"I think you need to enjoy your game a bit longer, Sebastian."

He laughed at the name his Young Master gave him. "I am good at fetch, am I not?" He pulled her closer and buried his face in her curls. "Come back to the Manor."

She pulled back and quirked her eyebrow at him. "And you would explain my sudden presence back to Tanaka, how? He is, after all, the only one who would remember me."

"My Queen," he sighed, petting her head for a moment.

"Yes, my King?" she whispered back.

"This place is a right mess and stinks of human blood." He pushed her lightly back to her feet and stood up, looking down at her slightly. "Do you not require some assistance in cleaning?"

She smiled a slight devilish smile and snapped her right fingers, instantly making the place reset to how it was before her marked heart got messy and she called for his assistance with the Reapers, and they shared their after fighting passionate night spreading the filth around even more.

"I love when you do that, so efficient and perfect," he sighed, pulling her close and letting his cock demand her attention. She simply smiled and pushed away and walked to where his suit was nicely draped over a chair they had broken in their fucking.

"All things new," she said, holding up the perfectly white gloves he wore to hid his mark and demonic nails. Plus it was just good manners to be look perfectly presentable.

He glided over to where she stood and re-dressed himself, in a blink of an eye. He took his time pulling on his gloves and snapping them with the same devilish look she had when she repaired everything. Before he could snap the right glove on, however, she captured his wrist in her hands and turned it so she could fasten the button.

"I do think we are ready for our day, my lord," she said, smoothing his top coat.

"I do believe you are right, my lady," he answered, settling his hands on her hips. "I bid you a good day."

Katherine surrendered to his deep kiss and pushed him into the wall as she kissed him back. "May today be a step closer to you devouring the young Phantomhive's soul."

She laughed as his eyes flared and he licked his lips; the small part of her marks' soul she could rip away for him before the Reapers got there, was just enough to keep him at bay. She made sure to keep him well cared for, as a good Master and Servant of Michaelis should.

And in a flash, they took off in opposite directions, knowing that the longing of each others bodies and what they each protected on one another, would call them back.