Disclaimer- I don't own Kuroshitsuji, it's plot or characters.

Pairings: Immediate!William/Sebastian, Gradual!Undertaker/Grell.

Warnings/Author's Note: Rated M for *mature cough* sexual intercourse *giggle*, violence, and language. M/M smut! It is also my second time writing smut for a story, so please give me advice on it if it sucks. Extra warnings at beginning of chapters. Takes place sometime during the anime, AU-ish, possible OOCness.

***Possible Character Death*** I'm sorry if I rip your hearts out at the end of this.

I write Grell with female pronouns, as it is a habit of mine, though people who think of her as a man will refer to her as a man.

First few chapters were beta-read by Crimson Dyed Silk. The rest is not at the moment though. Sorry for any mistakes.

*Warning for Chapter One- Contains slight M/M smut. Not too much but a bit.

Chapter One-First Deceit

Sebastian was quietly finishing putting the dishes away, not trusting Mey-Rin to do so. God forbid she wake the Master, who had fallen asleep an hour ago. Feeling antsy, he glanced at his pocket watch every few minutes, before moving onto the next chore. The manor was quiet since everyone else had gone to bed already. Sebastian was, as always, finishing the others' chores, the right way.

Suddenly, there was a small sound from down the hallway. Sebastian begins smirking to himself and heads towards the source of the noise, all chores forgotten. He opens the door to the nearby guest room and approaches the window, cracking it open just enough for entry.

"Back so soon?" He chuckles, standing back to let William in.

"Obviously." The reaper climbs through the window effortlessly and looks around. "So, is everyone asleep?"

"Of course, I made su-" Sebastian falls silent as William crashes his lips against his own. Letting out a pleasurable moan of surprise, Sebastian kisses him back for a moment before pulling away.

"At least let me close the window." Sebastian quickly closes the window and he turns around halfway, his smile growing wider as Will wraps his arms around his waist. Sebastian sighs, leaning back against him. The reaper brushes the back of the demon's neck with his lips and closes his eyes.

"...Bedroom?" Sebastian questions.

"Obviously. "

Sebastian grabs William's hand and practically runs to his room with William in tow. Upon entering the room, William shoves his lover against the door, effectively closing it. He kisses him greedily once again as Sebastian lets him take the lead, settling for wrapping his arms around his lover's neck. Groaning, Will grabs Sebastian's legs, lifting them up to wrap around his waist. He pins Sebastian to the door, grinding their hips together slowly. Soon William's mouth moved lower to start kissing the other's jaw. Sebastian closed his eyes and sighs again lightly, tilting his head back.

"Can we move to the bed?" The demon's voice was apathetic. He could care less about where exactly this was going to happen, but he wanted to ask the question anyways. Will paused, pulling away so they could look at each other.

"No." Will licked his lips slowly. "You look very much appealing against the door like this, ready for me to take you."

"Well, then," Sebastian smirks, "what are you waiting for?"

Hastily, William went back to kissing his jaw, nipping slightly. Sebastian holds on tighter. He usually prefers to be the dominant one and so did Will, but just this night, Sebastian was willing to let him take the lead. Spending the day as the Phantomhive butler was tiring after all. He didn't feel drained physically, but it was alright to just lay back and receive this time or, in this case, get grinded on against a wall.

Breathing heavily, Sebastian felt his cock spring to life with each thrust, held back by the layers of cloth. His breathing quickens and he tilts his head back, letting Will kiss and nip his neck. His eyes close, shutting out the dim light of the candles. All that he wanted to feel was the sensations, the vibrations that moved across his body. Enjoy the sweet scent of shampoo and laundry detergent that followed Will everywhere, along with the smell that was purely William. He notes the way he yearned to pull off these human clothes. The primal instincts threatening to take him over.

Moans filled the room quietly, and Will turns to a nearby table, setting Sebastian on top of it. He begins pulling at the demon's shirt, tossing aside the vest, throwing his own jacket on the floor. Will pauses again to stare at him. Sebastian feels impatient, even a bit irritated. He smiles coyly.

"See something you like?" The demon licks his lips seductively. Neither of the males say anything, both trying their hardest to figure the other one out. A feat that was complicated with their guarded expressions up at all times, even when they showed a flicker of emotion.

Instead of saying anything, Will leans forward to kiss him softer, closing his eyes. His hands tangle in Sebastian's hair, and he let out a quiet sigh. Not saying a word still, he moved his hips, getting a moan from Sebastian in response. He began working at his clothes again, Sebastian helping him. Struggling, they kept pausing to pull at each other, kiss each other, the heat between them growing. A want, an unspoken desire rising higher.

Sebastian wrapped his legs around Will's waist again, using the leverage to pull him against him. Will lets out a desperate moan, pushing up for more friction, but then there was a loud crack. The table holding them up broke and it sends both of them to the floor.

Will fell on top of Sebastian and they stare in silence for a few seconds.

"... The Master will not be pleased." Sebastian smiles slightly.

"Ah, move to the bed this time?" Will asks.

"Obviously. And keep it down, you're moaning loud enough to wake up all of heaven and hell."

"And you're any better?"

"... Shut up."

Sebastian chuckles quietly to himself. Here he was, the Raven demon, an evil entity, lying in bed with a Reaper. And said Reaper was fast asleep, his eyes closed as he slept soundly on the bed. My bed, Sebastian thinks. He watches Will, taking note of the way his eyelids twitched every so often, the way he made noises that sounded like muffled words. The way he kept adjusting his sleeping position, more and more frequently.

Sebastian knew Will was going to wake up soon, maybe in about an hour. That man practically had a real inner clock, waking him up at 6 am every morning regardless of how late he went to bed the night before. Sebastian picks himself out a new set of clothes to replace the ones that were ripped off him hours earlier. He had already washed Will's clothes for him earlier as well. It was easy, given that Sebastian did not sleep, nor tire like a normal mortal or reaper.

He approaches Will, leaning over to whisper in his ear.

"Willl..." He pulls away to watch him, but all Will does is mumble a bit. Sebastian smirks and pulls farther away.

"William T. Spears, get up now!" Chuckling, Sebastian jumps back as Will sits up, disoriented, wearing a 'someone's about to die' look that brought an awful glare to his face.

"That was unnecessary!"

"Was it truly? You needed to get up. And William, I'm to your left. Get your glasses on."

"You could have asked normally. What is the time?" He reaches around, feeling for his glasses on the nearby nightstand, fixing them on his face quickly before looking at Sebastian with annoyance.

"About 5:30 am."

"God damn, I need to get home and have a bath." Yawning, Will gets up and put his clothes on, forcing himself to fight through lethargy as Sebastian watches him quietly.

"Will I be expecting you later, William?" Sebastian inquires.

"I don't know. Will you?" Will's face hid away any hope that he was feeling. Yes, he did want to see Sebastian later, but no, he wasn't going to answer his question properly.

Having no idea what to say, Sebastian smirks. "I must leave now. The young master will be up soon. You know the way out."

After Sebastian leaves, Will sighs and leaves through a window. If he left through a door, a servant might see him. Silently scolding himself for staying so late, he quickly made his way into the Reaper realm. The only way to get there was through designated portals. They seemed normal at a glance, but humans couldn't go through them even if they tried and if the occasional demon got through, they were promptly dealt with. Reapers, an organized bunch, despised the very idea of vermin infecting their home. Reapers were strict. Well, nearly all of them were. There was one reaper, a redhead, one that William inwardly cringed at whenever he heard his name.

Once out of the human realm and into his own, he headed home. The morning was his favorite time of the day. It was silent except for the tweets of birds and the buzz of insects. Everywhere was serene and peaceful with no one around to interrupt the calm; the air smelled fresh and clear. William hurries along, deciding he needs to get home soon. The sun was starting to rise, turning the sky orange with purple clouds. It was pretty, beautiful even. Already planning the day out in his head, William kept on walking silently. Then that silence was interrupted by a voice, a feminine voice William had the pity of hearing everyday for centuries. That voice that pierces silence like a knife; a voice that could only belong to his colleague, Grell Sutcliff.

"Will? Will! Will, darling, what a pleasant surprise!" William can hear Grell's heels click as she ran after him, but William walks on as if he hasn't noticed.

"William, my love! Wait up!" Grell eventually catches up to him and starts skipping along as soon as she is by his side. "Ah, once again, so cold, ignoring me!"

"I didn't hear you," he lies. While he'd normally say something like, 'I just hate talking to you,' he wasn't going to now. Doing so would cause Grell to pout and whine and follow him like a dog. He couldn't be bothered, he had to get home to have time to clean himself up.

"I was calling your name loudly," replids Grell, trying to hold William's arm, which William quickly snatches away from her. Pouting, Grell asked, "Where were you?"

"What do you mean?"

"You look like you came from... a night out."

"I wonder why that would be," William mumbles. He looks at Grell, sensing that the other was upset or jealous. "Why do you ask?"

"I was just merely wondering if you had some maiden hidden away from your friends, some girl you might be sleeping with," Grell exclaims. She was teasing him, but William knew it was just to hide the fact that if Will were sleeping with someone, it would anger the redhead. William wouldn't put it past her to be the type of person to hunt someone to the ends of the Earth simply for sleeping with her love interest. A love interest, Willia, corrected himself; Grell was notorious for hitting on Sebastian, and god knows who else she lusted after. William toys with the thought of answering yes just to spite her, but, in the end, it'd only cause problems that he himself would eventually need to deal with.

"I was out fighting a demon." It was only partially a lie, wasn't it? The way Sebastian could roughly toss him onto the bed and gently but firmly hold him, kiss and bite his neck-

Realizing the path of his thoughts, William blinks, feeling his cheeks heat up. He glances at Grell, who looks doubtful. "Really, I was out fighting a demon."

"... Huh... then why's your hair messy and not your clothes?"

Oh shit. He knew he was caught red handed in a lie, but he could lie some more and play it off. It was something that he had learned to do his whole life and something he commonly did with Sebastian. It was easy to lie.

"I changed my clothes."

"Where?"

"At Ronald's." William keeps looking forward, remaining impassive as he always does. "I leave a spare set there for such occasions like this.

"Really?" Grell watches his every move.

"Yes. Do you honestly doubt me Grell?" William walks faster, wanting nothing more than to be alone. If he plays his cards right, Grell would brush it off. No one would suspect him, William, to be sleeping with someone, much less a demon. Grell would end up dismissing those possibilities.

"I guess you're not that type of person..." Grell sighs, running a hand through her long red hair. "... Wait... why do you keep clothes at Ronald's house? I didn't know you were that close. What about me? Do you not trust me enough?"

"What?" William looks at him, frowning. "You're joking, right?"

"I am not. You can trust me, Will!" Grell slinks up next to him and grabs his arm. Batting her large red eyelashes, she smiles to show off rows of shark teeth.

"Get off me. Who would be stupid enough to trust you?" William shakes her off and Grell steps away, looking hurt as she crosses her arms in defiant anger.

"Plenty of people trust me."

"Like who?"

Grell says nothing; she just stands there glaring at her supervisor.

"Precisely." William walks faster.

"I'm a good person. I can be reliable. My work is flawless!"

"Sure it is."

"It is and you know it! You know I can be trusted."

"Grell, you are unreliable." William stops, turning to look at her. "You are narcissistic-"

"I just care about taking care of myself-" Grell flips her long healthy hair pointedly, placing a hand on her hip.

"You are loud and annoying-"

"Eccentric, darling!"

"Sadistic, masochistic, perverted-"

"But blood is pretty, and I'm just very open about romantic and sexu-"

"Grell..." William sighs, pinching the bridge of his nose. Like every argument with Grell, this was going nowhere. The only thing Grell could say was that she was excellent in one field of her job, reaping souls. She was great at it and great at investigating cases, but writing up papers, filing folders, and any other office work was done terribly. Yes, Grell got the job done- at a price, something that continuously irritated William.

"Yes, Will?" Grell smiles in her normal creepy fashion. You could throw a wall of insults at the redhead, and nornally she wouldn't give in. If anything, she'd just chop the name caller into tiny pieces with her death scythe, but not Will, never Will, which was also something that annoyed the man to no end.

"Grell... yes, your work is exemplary," William pauses while Grell beams, and he sighs. "But, you are lazy with it, sloppy. You procrastinate, you are disrespectful, and have no regards to other people's boundaries. No one wants to work with you because they hate you. Ronald is one of the few exceptions because I have taught him to be respectful to other coworkers. You are only a reaper because I pity you and I'm not even sure if it counts as pity."

Grell hesitates, trying to come up with something to say. "... But, you respect me-"

"I do not. It is easy to lie. Grell... I really, really... " William tries to think of a word, but the only one that comes to mind is 'hate'. Saying those words is ... cruel, perhaps too cruel.

"... I just don't like you."

"Alright..." Grell pauses before taking a few steps back, looking at her feet. She stands there for a painfully long moment and for the first time in a while, William feels awkward.

Grell looks back up at him. "I won't bother you again."

"Grell-"

"I understand." Grell begins to walk away, looking defeated. "I wonder why I thought you'd be sleeping with someone. It's truly hard to love someone like you, so I don't know how anyone else can, only someone as cold as you could."

William watces her walk away, not speaking. The sounds of heels clicking fades into the distance and William forces himself to turn away. He'd always wanted Grell to go away and he'd finally gotten his wish. Now, he thought about what it'd be like to see him at work everyday, probably awkward after what just occurred. Then again, Grell might just be making him feel guilty. It'd be like something she'd do. Shaking his head, William went the rest of the way home, hoping he had time for breakfast. He had to convince himself that what he said was necessary. Besides, it wouldn't change anything. At least, it never had in the past. All that would happen is Grell would be moping around the office and pouting more every time Will was nearby for the next while. No, William could just ignore the issue right now.

Wasn't it easier to lie anyways, even to yourself?