A/N: Ciel and Sebastian have found their way to America after their many years of traveling together. Ciel is now a demon and Sebastian is still contracted to him. Lately, Ciel hasn't been feeling quite like himself and soon learns what it means to be "in heat".

Warning: Sebastian x Ciel; Mature themes.

Halloween Heat

A mansion stood at the end of a long drive, the surrounding land a beautiful landscape. The stones of the manor a cold, pristine grey white and the windows glinting in the sun. Surely the family who lived there was enjoying luxury fit for an earl, for an earl had once owned such an estate. Whether it really was the same as it was so many centuries ago was a complete mystery to Ciel Phantomhive. He had left it long ago when he became a demon and had decided to never look back. For all he knew, it could be nothing but either an old, dilapidated manor or a field of nothing, maybe more houses and businesses having been built over it.

Regardless of which it was it was of little worry to Ciel as he walked down the dark streets of Pittsburgh. He had spent several decades in the demon realm learning his newfound abilities before he and Sebastian had spent a century or two traveling the globe. They had found themselves in America and furthermore in a smoggy city known as Pittsburgh. It was late October and Halloween was only a day away. Not that Ciel would be celebrating it. He may still look like his kid, having only grown to be able to pass for at least sixteen, but he was far from a child now. However it seemed that everyone else was just ecstatic about the holiday.

More than a little irritated, he walked up the steps into a grand hotel and went up to his room, a beautiful suite that was quite luxurious in today's time. He opened the door and stepped in to see Sebastian sitting on the couch as he watched the news. It was definitely something he had had to get used to. After all, having a personal butler was not as common as it used to be so while Sebastian was still contracted to serve Ciel, the whole relationship between the two had mellowed out in the last couple decades. It had definitely been quite the show when Sebastian would try to teach Ciel something and Ciel would end up being able to get away for a while by running or ordering him to shut the hell up for a few.

Giving an exasperated sigh, he sat down beside Sebastian on the couch and earned a slight smirk from the older demon. He shot him a glare and stared at the television set before them. There was nothing new really going on with the world just yet. Ciel and Sebastian had made it a habit to keep up with the times so they could better blend in, unlike a fair few of the other demons that had been found and killed. Information was power and power meant survival; Ciel meant to survive and Sebastian along with him.

"Any luck?" Sebastian asked, not bothering to turn his attention from the screen.

"Not particularly. At least, none that would be very filling," he said, crossing his arms as he recalled his fruitless search for a couple decent souls.

Due to the contract, they had found that Ciel had to make all the contracts for both himself and Sebastian. Once the terms were complete, Ciel would allow Sebastian to take the soul and then he would have to create a separate contract afterwards for himself. It hadn't been too much of a hassle until people started to change. It seemed that a very good and filling soul was hard to come across nowadays. It seemed that the only way they were assured a good meal was if they took a young kid or adolescent into a contract and that in itself was now a bit risky for them.

"Can you afford to be picky? It has been a while since we last had a meal."

"I think we can afford to be at least just a little picky. It's not as if we are starving and I am not up to settling for anything less than half decent," he said stubbornly, crossing his arms.

Sebastian gave a small chuckle but he allowed the conversation to end there. Ciel was glad as his body was beginning to react weirdly again, as it had for a couple days now. It was only strange because from time to time he would experience this great desire for pleasure. Now Ciel wasn't naïve when it came to matters of the flesh but it wasn't as if he had participated in such activities; the main reason being he looked like a child and the other being that he could easily take care of such things himself. However, with these recent occurrences where he needed release it was proving not enough to take matters quite literally into his own hands. He wasn't going to ask Sebastian about it either as he was sure it would go away; he just hoped it would be soon.

Needed to distract his mind and body, he glanced at the letters on the table and reached for them. A few were bills but the rest were a collection of thank you letters to invitations to Halloween parties. He saw one from a well respected business owner and recalled how a few of his employees had been quite appealing.

"Mr. Alexander Shultz is having a party tomorrow. Maybe we can find a meal there but they only problem is we need to be in some sort of Halloween attire," he said and placed the letter back on the table before facing Sebastian. "Think you can handle that?"

"Of course," he replied and stared at Ciel intently as if he was looking for something before he next spoke. "I will put together several options. Anything in particular you would like?"

"I don't want a full costume. Just something that would be acceptable for the holiday without making it too extravagant."

"Yes, my Lord," he said and gave a smile as Ciel rolled his eyes before re-crossing his arms and sitting back into the couch.

~6-9~

Ciel woke to find himself in a dreadful sweat, his body heated and desperate for release. What exactly was wrong with him? This heat was beginning to frustrate him as every time he seemed to handle things, he only felt more in need. If there was one thing he knew, it was that his body wanted more but he was not going to bed down any human females just because his body needed release. He was really aggravated that he had spent a night sleeping, hoping it would help his new predicament, when he could have been doing something more meaningful. After all, it wasn't like he needed as much sleep as he had when he was human.

Having at least pacified his desires, he got out of bed and went to go clean himself up in a hot bath before changing into a shirt and jeans. He hadn't enjoyed having to get used to the new clothing but it seemed that people looking well dressed at all times was a thing of the past, people only worrying about it when the occasion called for formal attire. He hadn't completely kicked the habit of dressing up but he had reluctantly pulled back on the number of days he did.

Frustrated, and more than a little aggravated, he walked out of his room to see Sebastian had worked on their attire for the party later. He looked at the selections before his eyes were caught by a deep blue outfit, much like the one he had worn when he was younger but tailored to fit his more adult form. He ran his hand along the smooth fabric and he recalled a few memories from his past life, feeling nothing as he had long detached himself from his old life. His choice had been basically made for him except when he saw a pair of black cat ears sitting beside it. Did Sebastian honestly think the he would wear those? Ciel was allergic to cats and he definitely did not like the beasts.

Speaking of Sebastian, the demon himself came out from his own bedroom and looked at Ciel. He gave a smirk when he saw that Ciel was admiring the blue outfit. Ciel just shot him a glare and went to sit on the couch. Sebastian then walked over to the outfits and picked up all but the blue one, folding and then going to put them away. Ciel didn't bother to stop him seeing as how he had made his choice but he was definitely going to be making sure those cat ears were put away.

"Ciel, I am going to go send the paperwork you had done for this month's business plans. I also have to attend to a few other things in the demon realm. I will be sure to be back before the party so I can attend to your dress. Is that alright?"

"Yes, it is. Just make sure that you do get back in time. I am not going to that party alone. You will most likely have better luck than me luring a meal or two," Ciel said, not bothering to even spare Sebastian a glance.

Ciel could feel Sebastian's stare as the silence settled between them. Ciel kept his attention glued to the screen, not really trusting his body at this particular moment. Could Sebastian tell that he was frustrated? That his body seemed to be in some strange fever? The blasted devil most likely could or he wouldn't be staring so much and most likely with that annoying smirk of his. Ciel heard him turn and leave, though, with a soft click to show the door had closed behind him. He let out a small sigh and turned the television off before heading over to a desk. Maybe if he worked on some more of his paperwork he would be able to make it through the day without driving himself insane from desire.

~6-9~

Ciel looked at himself in the mirror as he enjoyed the feeling of wearing proper clothes once again. He had decided to dress himself without Sebastian's help before he got back and had to admit that he hadn't done terribly bad. His neck cloth, eye patch and the cat ears lay on the dresser beside him as he took in his appearance. The jacket fit perfectly over his blue, black and green shirt that gathered in the back loosely, a long tail of the fabric coming down and tailored so that he could walk without tripping himself or others. He had on a small black corset that had a double row of silver buttons up the front as well, just covering his stomach. His bottoms came down to his knees with the thick black cuffs covering them. His shoes buttoned up to mid calf and black bands helped keep his socks from falling down. To finish the look, he had on his black gloves and had taken out his walking cane.

As he took in his appearance, he reached one gloved hand out to grab his eye patch but Sebastian had come back and now held it himself. Ciel shot him a look and just turned his attention back to the mirror as Sebastian tied the patch on for him, covering the glowing brand of their contract. He next tied the neck cloth into a bow and reached for the ears.

"Do you honestly think I will wear that?" Ciel asked.

"It is Halloween after all and I thought it would be appropriate. Besides, I am sure one of the lovely ladies at the party will appreciate them and that lady just might have a decent soul," he said and placed it on Ciel's head before he could argue.

"What the bloody hell is it with you and cats?" he fumed, crossing his arms but not bothering to take them off, causing Sebastian to smile wickedly.

"What does the young Master think of my own attire?" he asked, and Ciel turned his head to see.

Sebastian had decided to wear his old butler outfit, everything meticulously in place down to the pocket watch he kept. He found he appreciated the look very much and had to mentally shake himself away from such thoughts, cursing this desire that coursed through him. He grabbed his cane and turned to face Sebastian, the air of an Earl blatant to see. It felt good to be in his proper clothes again and with Sebastian looking the part of his butler.

"Definitely appropriate," he said and turned to head out of the bedroom.

"You know, you have been acting rather odd. Are you sure you are fine?" Sebastian asked, a sort of amused glint in his eyes as Ciel regarded him for a few.

"I'm fine. Let's go," he said and left.

Sebastian merely smirked and gave a wicked grin as he followed Ciel.

"Yes, my Lord," he said, earning a weird look from Ciel that made him grin even more wickedly.

~6-9~

Already after an hour and a half of mingling among the crowd, looking for a decent meal Ciel had managed to amass a good amount of compliments and stares. He had found a pretty decent soul as well and had Sebastian working on convincing her to enter into a contract that would allow him to be able to take her soul preferably soon. Although he really wasn't starving, his body seemed to be craving a lust for pleasure, blood and a chance to dig his sharp nails into someone's flesh. What really bothered him was that he wanted all three at the same time.

So for now, he stood leaning against the wall in some corner as he ignored anyone who looked his way. No one approached him and he was just fine with that because he didn't want to deal with them. Not with the way he was feeling or else he may just end up ripping out someone's throat. Of course, he saw Sebastian coming toward him, alone, and had to glare at him.

"Well?" he asked, crossing his arms as he stepped away from the wall.

"She made it clear that she would only form a contract if I had a little fun with her," he said, emphasizing the word 'fun' to make his meaning clear and smirking at Ciel's expression.

"Absolutely not," he said all too quickly and saw a small look of surprise on Sebastian's face before it was gone.

"Oh? What reason have you to refuse such good fortune? Besides, it's not as if it's the first time we would have formed such a contract. Her soul is rather clean too and should fill you for quite a while," he said as he continued to look at him curiously.

"Well if you have no qualms then fine. Bring her to me out on the terrace," he said and stalked past him to head out onto the dark, abandoned terrace.

He hands gripped the stone railing that protected everyone from the high floor and the long fall down onto the concrete below. The party had been held in old hotel that reminded him a bit of how luxury was in his younger days. Of course it did nothing to soothe him as he felt like tossing someone over the rail and onto the concrete below. He could hear footsteps behind him and he tried to mask his features as best his could. He wasn't sure why he was so irked by the terms he would have to agree to. They had made such arrangements before in the past and this time should be no different given they no longer had the luxury of waiting too long for one soul.

Taking a deep breath, he turned around and watched as Sebastian brought a young woman to him. She was actually quite pretty with her dirty blonde hair and tan skin. She was wearing a medieval type gown and seemed confident standing there in front of him. It wasn't a bad thing that she was confident but a little fear would have been nice too.

"You understand the terms as told to you by Sebastian?" he asked simply, staring at her with his cold mask in place and enjoying the brief look of uncertainty in her face.

"I do," she said clearly, her voice not wavering.

"Fine then," he said and grabbed her hand. "The contract is made. Go."

Ciel turned around, not bothering to look at Sebastian as he heard them leave. He really didn't want to think about the contract he just made and the fact that Sebastian was with the woman right now. He had never felt jealousy before but this unwavering lust was clouding his mind and it made him miserable. No amount of releasing himself seemed to be helping and the frustration was beginning to make him irritable. Not to mention the other feelings of needing to bite, claw, and essentially kill. His mood lifted though when he thought about how he could take the girl's soul soon and he could make sure it hurt.

His mood somewhat lifted he turned around and headed back into the room to hear music playing. The majority of everyone there stood about in a circle as they clapped at a couple dancing in the middle. Not quite tall enough to see, he managed his way through and halted, a bit surprised at what he saw: Sebastian and the lady were dancing and she had a huge smile on her face. This was definitely not what he had imagined when Sebastian had said 'fun' and he was sure Sebastian had merely been playing with him unless this had also been part of the deal he was supposed to uphold. He crossed his arms and glared at the couple before turning back around and headed to the corner he had stood at earlier. The music ended and Sebastian continued to hang around with her before escorting her away. It wasn't long until Ciel decided to follow them out the door to the empty entrance hall, standing by the stairs.

"Ciel," Sebastian said lowly from above him and he looked up. "She is ready."

Wondering how on earth they could have gotten all that much done in such a short amount of time, he walked up the steps and followed Sebastian to a dark room. He entered and saw the woman standing as she looked out the window. She turned when they had entered and gave a small smile at Sebastian before turning to Ciel. Ciel just stared at her as he waited to see if she would say anything as her last words to him, for most usually did. This time was no different as she walked and sat down on the bed and looked at him.

"Will it be quick?" she asked, looking steadily at him and for some reason he couldn't find his voice.

"It should be but it may be more painful than it ought to be. He is going through his first heat so his urges are more in control than normal," Sebastian explained and Ciel wanted to attack him for having known what was happening with him but reusing to tell him; even though he hadn't asked but that was beside the point.

"That is fine," she said and gave Sebastian a smile. "Thank you for one last dance."

With that said, Ciel walked up to her and she closed her eyes as she sat there. Ciel took off the hand he had touched earlier and saw the sign of his contract as it glowed, his own eye beginning to itch as he took off his eye patch with his free hand. Part of him felt a bit bad for what he was about to do but that heat Sebastian had mentioned was escalating as he leaned in close to her, sensing the soul he was about to take before he bit into her neck, harshly, and feasted. The contract stung as he felt her soul leave and enter into him, tasting sweet. Although he had her soul, he continued to take in the warm taste of her blood, feeling pleasure as liquid ran down his throat.

He saw Sebastian as he continue to bite her neck and gave a feral growl as he tried to pull her closer. His entire mind only thought about the heat eating at him, fueling his need for blood, flesh and pleasure. Sebastian neared him and he let out another growl but that didn't stop the butler from prying the dead woman from his grasp. He snarled at him and shot him a deadly glare as he licked his blood stained lips. Ciel made to take back the body before he found himself pinned under his butler on the bed. He struggled to move but he held fast.

"It seems your body is rather excited, Ciel. Could it be that you want this that badly?" he asked, smiling wickedly as he traced his tongue along Ciel's ear, causing the younger demon to shiver. "Typically a demon in heat seeks out multiple preys before his bloodlust is satiated and then he looks for a warm bed to rut in. Some even take out both desires on the victims they kill. Luckily your first heat isn't all that bad and it will get easier to control as you go through more heats. Just know that this is more common among demons than you think."

While that was being said, Ciel had tried to renew his struggles as he attempted to throw Sebastian off. He knew, or at least his body knew, what was going to happen and while it begged for the pleasure being promised, Ciel fought against it. It may have been a slowly losing battle but Sebastian didn't seem to mind as he went about licking the blood from Ciel's lips, chin and neck, causing Ciel's body to throb and a few moans to escape his lips. His body arched up against Sebastian's. His wrists were let go and Sebastian moved his hands down Ciel body and began to take off his jacket, corset and shirt, still keeping his mouth on Ciel throat. Anticipation filled Ciel as his clothes were thrown on the floor and he snaked his hands in Sebastian's hair to hold him to his throat, not wanting that hot tongue to leave his skin. It felt so good to have his butler above him, pleasing him, and he wanted more. He moaned as Sebastian ran his hands along his chest, teasing and pinching his poor nipples. Shocks of electricity went through him with every caress and pooled in his lower stomach.

"Se-Sebastian…" he moaned out and tried to bring his hips up to grind against his butler's.

Sebastian held his hips down and brought his tongue to tease his navel, his fingers slipping under the hem of his pants to tease him. Ciel wiggled his hips as he growled out, wanting Sebastian to stop teasing him. A chuckle met his ears as he felt his pants being unfastened and pushed down his legs, a sigh of relief as his arousal was set free. He looked down at Sebastian and saw him slowly taking off his shoes, giving out a moan as he watched and felt him licking his way back up. Sebastian's teeth bit at the sensitive flesh on the inside of his leg, sending shivers up and down his spine. His fingers found their way back into his butler's hair, gripping tightly as he tried to force him to the part of his anatomy that needed release.

"So demanding," he teased and ran his tongue along Ciel's length.

Ciel moaned at the delicious feel of Sebastian's hot tongue on his straining member. His breathing was erratic as Sebastian continued to lick him, a low growl in the back of his throat as he bucked his hips. It was then that he felt the wet heat of Sebastian's mouth on his member, sucking him as his moans became louder and the desire began to build, forcing him closer to the edge. All of a sudden, Sebastian gave a loud hum and the vibrations sent him over the edge, giving a short scream as his body tensed and his bucked his hips up, his cum shooting into his butler's mouth. Once the spasms were over, he felt the cool air against his still semi-erect member and gave a whimper, still feeling that same heat.

He looked at Sebastian and watched with a heated gaze as the butler took off his clothing before covering Ciel's body once more. The feel of Sebastian's flesh against his own made him hard and the heat flamed within him again. Sebastian captured his mouth with his own, nipping his lip before sucking on it gently and their tongues tangling together. His hands gripped Sebastian to him, his claws digging into his skin, which elicited a groan of pleasure from the older demon. Sebastian's own hand had made its way between Ciel's legs and he felt as a finger entered him, lifting his hips to give him better access. Another finger was added and then another as he felt himself being stretched before Sebastian positioned himself at Ciel's entrance and thrust into him full hilt. Ciel let out a sharp growl as he clawed the older demon's back, a strange pleasure pain fueling his desire.

Hardly giving his body time to adjust, Sebastian continued to thrust into him, his strokes hard and hitting a spot within him that had him crying out with each thrust, his claws still tearing at Sebastian's back. In hardly any time at all, Ciel was crying out again as an orgasm washed over him, the pleasure seeming to not end as Sebastian didn't slow down and his strokes added to his pleasure. As his second orgasm began to fade, he felt another wave of pleasure building within him. Sebastian had begun to bite and lick at his neck and Ciel mimicked the action, feeling Sebastian quaking with his own desire above him. As a few more strokes had a third orgasm washing over Ciel, he felt himself sink his teeth into Sebastian's neck and he felt the demon's hot cum as Sebastian grunted with his own orgasm.

~6-9~

It was late the next evening when Ciel woke to find himself in his own bed, naked. He burrowed his face into the warmth the enveloped him and felt that his body was sore and sated, the heat having gone. He and Sebastian had spent the night pleasing each other before Ciel had cried out one last time, his body slick with sweat and the scent of sex in the air teasing his senses. His body had trembled and his breathing had been ragged as he felt himself doze off, an overwhelming need to sleep as his spent body recovered.

He didn't recall being brought back but he didn't complain, even when he felt warm arms surrounding him and pulling him closer. He opened his eyes and looked up to see Sebastian eyes staring at him, glowing red and still filled with a blatant desire that made him shudder. His eyes found their way to a mark on Sebastian's neck and he looked at him curiously, wondering why it hadn't healed.

"You'll find a similar one on your own neck," he said with a smirk visible on his lips. "I figured that if you were going to claim me that I should claim you."

"What does that mean?" he asked, his voice raspy from his night of constant growling and screaming.

"Simply that I belong to you and you belong to me. No other demon can steal me away from you and vice versa," a satisfied look on his face. "It looks as if I was never meant to steal that soul of yours away. At least, not in the way I had originally planned."

"Don't think this will change anything. You are still bound by our contract to serve me," he said, pushing away from Sebastian and sitting up.

"Of course," he said and gave a small chuckle.

Disclaimer: Kuroshitsuji (Black Butler) and all characters are the sole property of Yana Toboso and select affiliates. I claim no such rights and make no profit from these stories.