A/N: This is a birthday fic for my wonderful friend Akiruchan. -snuggles- I hope you enjoy it hun and that it's everything you wanted. She wanted a sequel to 'Guiltless Pleasures' where Sebastian was pregnant and from that little request came a massive 17K one shot. It'll be posted in three parts, with the next two posting on Wednesday and Friday. As with the specifics of demon mating, I made up the facts of demon birth as well, trying something different compared to the norm, so hopefully that'll be okay, haha. This first chapter is short, but the last two will be longer.

Warnings: MPREG! If you don't like it (even though I can promise it'll be different from most mpreg out there) I would suggest that you read with caution or don't read it all. There will also be angst, smut, malexmale action, and some violence. Plus understand that before reading. Thank you ^^

Disclaimer: I don't own Kuroshitsuji

The nights were different in their realm compared to the nights on earth. They had the moon yes and it provided just enough light but unlike the moon that dwelled on earth, their moon went through an entire months phase in the span of a single night. It would wax and wane throughout the night providing only a glimpse of the full moon for an hour or two before it started to vanish once more.

But unlike humans, demons didn't need the moon to see in the night. It was simply there as a mean of aesthetics and to help provide some light in the dead of night. The nights were darker here compared to earth and all sorts of creatures prowled the darkness, seeking lost souls and humans who wished to cave into the sweet temptation that only a demon could offer.

The nights were never quiet or peaceful either when compared to most parts of earth. Where all beings needed sleep in order to function, demons only slept as a luxury and would often stay out at night, enjoying the thick darkness that was only available in the place they called home. Deadly and sensual things took place in the dead of night where the screams of tortured souls mixed with the moans of pleasure to create a beautiful symphony that filled the night.

The noises stretched throughout the realm and reached even the castle where the lord of the realm lived, piercing the thick walls that had recently been rebuilt six months ago after the mating season had passed, as it had been a rather wild and violent season this year. It was no secret that Sebastian's fertile heat was that year and he was finally old enough to carry a child if his body would accept it. It wasn't expected though as he was still young in demon years and the chances of him catching on the first year were rare.

As it was, no one outside of the castle walls knew whether or not the young lord had caught or not. Even though the chance of such a thing was rare, it could still happen and as Sebastian's late birth had shown, anything was possible with the demon. Still, no word had been offered to the verdict, though whispered rumors circulated that Sebastian was with child but that Claude didn't want anyone to know yet, as he was already fiercely protective of Sebastian. If his mate were with child, his child, it wouldn't be a surprise that Claude was trying to keep everything secret to protect Sebastian and their unborn child.

And while many doubted that Sebastian had caught on the first heat, the silence offered to the subject didn't help the growing rumors. Sebastian wasn't hiding away from the public eye though, still going about his duties as the leader of the realm and making it seem as though nothing was amiss. Claude was always by his side, only helping to further fuel the rumors but that was natural and wasn't solid proof. It seemed that only those who were close to the mated pair knew the truth and they were keeping their mouths shut. If the rumors were true though, it meant that in less than a year, they would have an heir to the throne and that thought alone was enough to keep the rumors spreading as the realm buzzed with muted excitement.

Inside the castle walls though, things were different. The demons who lived and worked there knew exactly what was going on with the mated pair but it was their fierce loyalty to the two high-ranking demons that kept them silent on the matter, even though they knew the truth and were equally as excited as the rest of the realm. Although they had good reason to be excited, for they knew the truth. The truth that Sebastian was indeed with child after his first fertile heat and by next birthing season, would have his first child.

It had been six months since the mating season had ended and the birthing season for those demons that had caught the previous year had already passed. Unlike humans whose gestation period was only nine months, a demons gestation cycle lasted for twelve to fourteen months. A demon pregnancy, by either gender was hard and complicated, one of the reasons why the demon population wasn't overflowing with young each year. Out of all the pregnancy's that occurred, merely a handful ever came to pass and from those, only a small amount lived past the first few years.

It helped to keep the population under control and gestation for angels was equally as hard. They were both beings of energy and as such, that energy had to be created from somewhere first before it could stabilize into life. Naturally, the energy that was used to create the future child came from the demon that was carrying it, and if that demon didn't have enough energy to sustain the child, then it would cease to exist. More often than not, that was the outcome of most demon and angel births and while it was unfair, it was the way their kind lived. It helped to keep the delicate balance between humans and the supernatural, and was one of the reasons demons feasted on human souls.

While a demon would never admit it aloud, there was one thing they were jealous of when it came to the humans and that was the human's ability to have offspring. It was something every demon longed for at least once in their life, even though they acted indifferent on the subject in front of each other. Therefore, it seemed right to prey on humans who had something that they wanted; it was their way of getting even and greed was an emotion they knew all too well.

Every year there were at least three to five successful births, even though at least a hundred demons had caught during their fertile season. They were watched closely to make sure that they survived the first few years of their life until they were strong enough to handle themselves on their own. Because even though the birth population was small, there were always things out there that wouldn't hesitate to kill a defenseless newborn. Even other demons posed a threat to newborn demons, as jealous and greed ran easily through a demons veins and would often tempt a demon to kill a child because it wasn't theirs.

It was one of the reasons Sebastian was so closely watched when he had to leave the castle to do his job as leader of the realm. Keeping him locked in the castle was pointless as he could easily escape if he wished and trying to lock him away would only make the young demon furious, as Claude had found out the hard way. The moment Claude had scented the change in Sebastian's scent and knew what it was, he had refused to let Sebastian leave their home. Sebastian hadn't taken too kindly to that order and it had resulted in an argument that led to a long fight that stretched for hours, destroying part of the castle in the process.

After that, Claude had agreed that Sebastian could leave, so long as he stayed with him. While it was highly unlikely that Sebastian wouldn't be able to defend himself in case of an attack, Claude didn't want to take any chances and stayed with Sebastian at all times. The dominant demon in the relationship needed to stay near their mate in order to ward off any rival demons and ensure that it was their child that was born. It wasn't unheard of for another demon to attack a pregnant demon in hopes of changing the father to their favor.

And while it would often drive the mate crazy, they wouldn't push away the dominant but instead press closer as the pregnancy made them tired and slightly weak. It took a great deal of energy to sustain the child through all twelve months and it put a strain on the demon carrying the child, especially as the months went on. It was one of the reasons that demons carrying a child weren't supposed to do much other than sleep and relax, trying to help ease the strain that their bodies were going through.

But Sebastian didn't have that luxury and it was a silent fear that everyone in the castle shared, most of all Claude. As the leader of the realm, he couldn't spend most of the day sleeping, especially as no one knew about the pregnancy yet and they were trying to keep that information as quiet as possible until the mass of energy Sebastian was carrying had stabilized into life. Sebastian was still young and as it was his first fertile heat, the chances of it the birth being successful were already low, but with the added stress and work that Sebastian dealt with daily, the chances lowered even more.

The staff in the castle worked to make things easier for the young lord, but even they couldn't miss the sluggish movements coming from Sebastian and the fact the demon was going to sleep far more often and earlier than usual. But it was only Claude who knew that Sebastian napped in his office in the middle of the day and that at times, the simplest of tasks would tire him out.

Sebastian was stubborn though and refused to back down though, claiming that he could handle everything. Something that Claude knew was slowly draining Sebastian of his energy and a part of him felt responsible for Sebastian pushing himself harder each day. It kept Claude awake at night, watching the younger demon sleep soundly through the night, face calm but tired even in sleep. He could hear the whispers in the hallways about how Sebastian was growing weaker but didn't want to lose the child because it was something Claude so desperately wanted.

Even now, in the dead of night, those whispers still haunted Claude's mind as he watched Sebastian sleep once more. He hadn't been sleeping since he had realized Sebastian was carrying his child, although at first it was due to excitement and then protection. But now he stayed awake because he didn't know what was going to happen and Claude couldn't stop his hand from trailing down Sebastian's body to rest over the still flat belly. He could feel the energy churning just below Sebastian's skin, but nothing else.

Sebastian's body was focusing all its energy to help sustain the child that when he slept, Sebastian didn't bother with breathing or other bodily functions that they had but didn't need when in true demon form. It was unnerving to have Sebastian seemingly dead next to him in order to provide for their child; a child that Claude wanted so badly.

Claude's hand moved away from the mass of energy and came to rest around Sebastian's chest, pulling his body flush against his own so he could offer some warmth in the cold winter night. There was no heartbeat under his hand and the younger demon was practically limp in his arms, making Claude worry even more. Sebastian had never resorted to this degree of sleep before and if Claude hadn't felt the energy in Sebastian's body before, he would've believed the demon to be dead.

"…," he breathed, calling Sebastian by his demon name as his arms tightened around the younger demon. "I'm here," he murmured lowly against Sebastian's shoulder. He would provide support in however he could, not wanting Sebastian to think that he was alone in all of this.

Golden eyes blinked as Sebastian shifted against him and Claude looked down at Sebastian, wondering why he had woken so suddenly from his sleep. The younger demon jerked harshly and pressed back against him before Claude could feel Sebastian's heart start to beat under his hand as soft breaths fell from his mouth.

"Sebastian?" He called lightly, sitting up so he could see his mate.

"I didn't do that," Sebastian said quickly, his eyes wide before he bolted up in the bed. "I didn't wake myself up, I didn't do it. It just happened," he cried, voice trembling as his hand came to rest over the energy he was carrying.

Claude reached forward and covered Sebastian's hand, frowning at the erratic way the energy pulsed and fluxed in Sebastian's body before realizing what was going on. He pushed Sebastian back to lie down on the bed. "Just relax," he cooed as Sebastian's chest started to heave. It seemed as though Sebastian knew what was going on as well and was trying to fight it. "Relax Sebastian," Claude said, a bit harsher than he meant.

Raven locks swayed back and forth as Sebastian shook his head. "I will not lose it, Claude," he answered, curling in on himself and trying to force the energy that had woken him up back down into the mass that coiled near his belly. The energy there had snapped as his body was drained, the urge to live taking precedence over the future child that had been forming. It rushed throughout Sebastian's body, breathing life back into his veins and organs until he could feel his strength returning once more as the energy near his belly weakened. The action made Sebastian scream out in agony, realizing that he was losing his child, that his body was practically devouring what had grown there in the past six months.

His cries echoed throughout the castle and Claude could hear the servants racing to their room, no doubt fearing the worst, and they would come in to find it. Because despite Sebastian's best efforts to push the energy back into the weakening mass, Claude could already it flickering out of existence as the energy worked its way through Sebastian's body until all that was remaining was the excess that had been used to stabilize the mass of energy. But now that Sebastian's body had no need for it as the rest of his energy had been returned to his body, the only thing left to do was for Sebastian to expel what was left over.

The door to their chambers burst open just as Sebastian pushed away from Claude and doubled over, horrible retching sounds coming from his mouth before the excess energy splattered onto the floor. His body shook with the force it took to cough the surplus up and Claude cringed as the noises continued, each round sounding worse and worse as the next batch of excess energy was forced up through his body until it finally left his mouth.

From the doorway, Claude could see the servants and staff turning away, knowing what was going on and wanting to give Sebastian his privacy. Their faces were distraught, upset that Sebastian had to go through with this when things had been going so well in the beginning and saddened at the fact that there wouldn't be a child in six months. The castle's occupants had all shared Sebastian's and Claude's excitement when they realized the younger demon was carrying, and now they shared the anguish at the loss.

Claude rested his hand on Sebastian's back, feeling muscles tremble under his touch as Sebastian coughed up the last piece of energy until he was dry heaving, gasping for unneeded breath as the shock of everything that had happened was finally starting to settle into his mind. There were no tears streaming down Sebastian's face, but the torment was evident on his features as Claude pulled Sebastian back to rest against his chest, trying to soothe the younger demon.

Slowly, Sebastian's hand inched down to his stomach, searching for the mass of energy that had been growing there for the past six months only to feel nothing underneath his hand. The room was silent and everyone was holding their breath as they waited for confirmation, even though they all knew that there was no way the child was still there.

The cry that left Sebastian's throat after the knowledge sunk in was loud and tortured, making Claude shiver and clutch Sebastian tighter as he continued to howl. No doubt, the sound was piercing the castle walls and half the realm could hear the noise but Claude couldn't bring himself to care. The only thing on his mind was Sebastian, knowing how hard it was on him and how he was feeling. It was a painful thing to know that they had lost their child, but not as painful as having almost lost Sebastian.

The sacrifice wouldn't have been worth it and Claude wrapped his body around Sebastian's as the last wailing note trailed from Sebastian's throat, leaving only silence in the room. Sebastian's body shook in his arms and Claude looked up to see the staff still standing in the doorway, waiting for orders. Anything to do that could offer help.

"Leave us," Claude found himself saying before burying his face into the crook of Sebastian's neck, inhaling the scent there. It smelt once more of Sebastian without the added scent that was there when he was carrying. A soft nip was placed to the skin as the door closed softly and Claude gripped Sebastian tighter, the younger demon unresponsive in his arms. "Its okay, Sebastian," he murmured, saying the words repeatedly.

There was still no response from Sebastian and Claude slowly lowered them to lie down on the bed as he pulled Sebastian closer, whispering softly to the other demon, letting him know that everything would be all right.