Title: Buffy's Demon

Disclaimer: Everybody belongs to Joss Whedon, ME, UPN, FOX, etc etc. Not me.

Rating: A tentative R. May become NC-17 at a later chapter, I don't know.

A/N-This is a sequel to Spike's Soul. If you haven't read Spike's Soul, you will be confused and not understand what exactly is going on.

Chapter 1

'Fuck' was Buffy's first thought when she heard Giles' announcement. 'Fuck, fuck, fuck.' But she didn't have time to dwell on the fact that she was now housing a demon because the vampires chose right then to attack. Jumping over Spike's body without a second look, she fell upon the attacking vamps in a frenzy.

Everything passed in a blur. This was so different, and yet so alike, when she was in full Slayer mode. The slaying wasn't just a second nature. She was more powerful than she had ever been before. Without even breaking a sweat she fought brutally and efficiently, and before she knew it, all of the vamps were dead.

Except one.

He still was unconscious, but Buffy was fine with that. As long as he wasn't dusty. She ran to his side, the rest of the gang following closely behind her. She knelt beside him, feeling his body for bruises or broken bones. Other than a few bumps here and there, he was uninjured.

"Did anybody see what happened?" Buffy asked. Her voice sounded funny in her own ears. Exhausted.

"He helped you drive the stake through her, then he passed out," Willow informed her. "That's all we saw."

"Maybe he's a human now?" Anya suggested hopefully, though she knew better.

Buffy shook her head. He was still a vampire. "Let's get home. When we do we can figure all this out."

Buffy picked up Spike effortlessly and through him over his shoulder. She led the way out of the shell of the high school as if she was carrying nothing heavier than a bag of apples.

"Giles," Xander whispered, "Did you see her eyes?"

"When?"

"Well, now."

"Yeah."

"Why are they purple?"

"It's Lilith."

"Why were her eyes golden before?" Willow inquired, overhearing their conversation.

Giles shrugged, "I imagine whatever .demon.. she had in her was responding to Lilith's presence." He still didn't like to think of what the real source of Buffy's power was. Though it made perfect sense. But a demon living inside the beautiful and strong Slayer? It was almost unbelievable. Almost as unbelievable as the fact that Lilith's power now inhabited her body and she seemed to be taking it in stride.

"If the demon is in her, why isn't killing all of us?"

Giles didn't know the answer that. But he suspected. He didn't want to answer them without doing a bit of research, and talking to Travers. He knew that Quentin was holding out on him, and quite frankly, he was sick of it.

Buffy hurried to her home, moving with almost lightning speed. That didn't register though. Nothing registered except the body in her arms. He was alive. He was still with them. It would all be ok now. So what if the Hellmouth didn't close like it was supposed to? She would worry about that later.

She soon reached her front door and let herself in, not even concerned about where the Scoobies were. She knew that they could take care of themselves. Spike needed blood she decided. For now pig blood would have to do, but in the morning she'd hunt up some human blood for him. Even if she had to force the gang to donate.

She set him on the couch carefully and then hurried into the kitchen. She heated up the blood to the perfect temperature and was surprised to find her stomach grumbling when she smelt the warm blood. This brought her up short. Since when could she smell blood so sharply? And why was it appetizing?

She forced herself to breath and calm down. There was probably a perfectly good explanation behind this. Perfectly normal and logical and . "Oh God," she wailed, "What if I'm a vampire."

Buffy listened for her heartbeat and quickly heard it, beating strong. Still unnerved, she found her pulse and felt the same strong beat. "Ok, so I'm not dead. What the hell is this?"

Before she could do anymore self-exploration she felt Spike wake up. She was used to the odd sensation of feeling Spike since the claim. When something about him changed or shifted, whether he went from sleeping to waking or frowning to smiling, she felt it. At first it was unpleasant. Spike moved around constantly, sending small shivers through her body every time he did. Soon though, out of necessity, she learned to ignore those feelings unless she wanted them.

"Spike, I have some blood for you."

His face quickly changed and he closed his eyes slightly, glaring at her. A growl began low in his chest and soon reverberated through his entire body. "Slayer."

Buffy frowned. "What's wrong with you?"

Spike didn't answer. He was staring at the pulse at her throat, mesmerized. All he knew was that he was hungry, and the Slayer stood before him full of sweet blood, and all he had to do was reach out and grab her. Without further thought, he grabbed her arm, and pulled her to him, catching her off guard.

She fell on top of him and before she could struggle, he buried his face in her neck. She froze, and he smelt her fear. What was worse, he felt it. She was his mate. Surprised he threw her away from him and jumped up, vague memories coming back to him. They were in a fight. They killed something. There were other humans.

She was looking at him with wide, startled green eyes. They stared at each other for an eternity before Spike's face changed and confused blue eyes looked to her for answers. Before she could respond, he fled.

She brought a shaky hand up and wiped the hair from her eyes. Something was seriously wrong with the chipless, soulless, Master Vampire.

Fuck.

***

Spike ran as if his life depended on it. Come to think of it, his life probably did depend on it. He had tried to feed from the Slayer. There was no way she was going to let him get away with that.

The further Spike ran, the more his head cleared. By the time he reached his crypt he had completely gotten over the bloodlust and he nearly remembered everything. He didn't stop at his home though, but kept moving farther and farther away from Buffy's house.

By the time he reached Sunnyhell's city limits, his mind was completely clear and the demon was firmly under control. He remembered waking up, twice, and both times he needed, wanted, and craved her blood so bad he was more than willing to kill her. But both times the surprising fact that she was his stopped him.

What else did the situations have in common? That he was unconscious? That didn't make any sense. Spike had been unconscious around the Slayer before and never felt the urge to suck her dry. He hadn't wanted to feed from her, really drain her, for nearly three years. Now in the same night he was tempted not once, but twice.

Spike began to walk back to his crypt, deciding it would be best to beat the sun home. His mind raced, replaying the night over and over. There were, of course, huge voids, but he knew that's when he had been out cold. What had happened to all of them while he was gone?

Another thing that bothered Spike were Buffy's eyes. When they had left the house earlier that evening, they were the beautiful green they have always been. By the time they reached the school, gold sparks flew from her eyes and the depths danced with energy. That night when we woke up, they had temporarily flashed purple. In his muddled, hungry, confused state he almost didn't notice. But they were definitely purple.

What the hell was going on?

***

Giles, Anya, Willow, and Xander finally reached Buffy's house. They were tired and just didn't have it in them to hurry. When they burst through the door they were extremely surprised to find Buffy sitting on the couch alone, looking shell-shocked.

"Willow? Help me get her to bed," Giles instructed, concerned. He knew that Buffy had had a difficult fight. She must still be reeling by the fact that the vampires hadn't died. But most importantly, she had Lilith's demon. There was no telling what exactly that was doing to Buffy and he was extremely concerned.

He knelt down in front of her, and she didn't even glance at him.

"Buffy?" He asked gently.

Her gaze shifted and now she was looking him straight in the eye. "Giles."

"Are you ok?"

Buffy frowned, "I'm tired."

Giles searched for the perfect way to ask the question he needed an answer to. "Buffy, are you in control."

"He ran away."

"What?"

"Spike tried to bite me, stopped, and ran away."

"Why did Spike try to bite you?"

"I don't know."

"Buffy, are you in control?" He repeated his previous question.

"I know she's here with me Giles, but I am definitely in control."

"Would you like us to help you to bed?"

"No," Buffy's voice was distant and Giles could tell she was no longer really talking to him. "I'll be fine."

She stood up and slowly moved towards the stairs, the energy and power she felt earlier gone. Now she just felt drained. Drained of blood, drained of life, drained of love. She paused at the base of the stairs.

"Giles, find Spike."

"Are you afraid he's going to hurt somebody?"

"He won't hurt you."

Then she was upstairs and they all heard the door shut.

"Willow and Anya, go get some sleep. I know how exhausted you must be."

"But we want to help you find Spike," Willow protested.

"Willow," Giles tone was still gentle, but commanding. "Xander, come with me."

"Do you think he's out terrorizing the locals?"

Giles shook his head, "I honestly don't know what's going on. We won't know until we find him."