Summary: Sebastian's sister makes a contract with a certain cute-obsessed fiancée. How will Ciel react and what is the purpose of the contract? Nothing that Sebastian particularly likes.

'My, my. You're certainly a very fiery thing. But this is quite a mess you're in.' The young demon witch spoke with a chuckle.

Elizabeth looked at her with strong green eyes, breathing hard and covered in blood as her hand shook even holding her fencing foil. She had willingly given herself up to the enemy this time. Only because… they threatened to have their stationed men kill Ciel. She didn't know of course, that Sebastian could've taken care of it. She just knew she had to protect him. They killed Paula when she tried to defend Lizzie.

The moment she was sure he was safe, she fought. She fought hard and prayed for a miracle. Any miracle! She needs to see Ciel again, protect and love him… She needs to get out of here. But she was bleeding and wounded and she was losing… 'Who are you?' she questioned imperiously.

'Me? I came to answer your sinful prayer. You did say by any means, correct? Even if it is by a corrupted inhuman thing like me?' the demon witch laughed, hiding in the shadows. The men were cowering away in fear of her but Lizzie scrutinized her, weighing her options.

'What is the payment?'

'Apprenticeship. I'm not a full demon. I don't need your soul. Make a contract with me and I will grant you your wish and the power to grant your own wishes. To become an immortal witch. Be my apprentice… for eternity. ' She answered with a naughty smile. 'What is it you wish for?'

'My wish… is to make my fiancée happy. To protect him for as long as he lives.' Lizzie said with passion. The demon witch smiled wider.

'I can grant that wish.'

'Then make the contract!' Lizzie commanded with an air of authority. The demon witch grinned and laid her palm against the side of her neck and a burning pain took over, making her faint.

Lizzie didn't know how long she was asleep but when she woke up she saw the witch. A young women, dressed in a black lace dress with a far too revealing neckline. She caught the sight of slit pupils and red irises. The men were dead. All of them were dead and there was not a drop of blood on this woman. 'Tell me then what terms you wish for.'

'You will obey me and never lie to me. Above all, you will help me protect my love and make him happy.' Lizzie said, struggling not to gulp in great gasps of air. She didn't feel well, the pain in her neck made her nauseous.

The witch smirked as if she expected as much and nodded her pretty head. 'As my lady wishes. Come then, let us return you to your household.'

The witch picked up Lizzie and carried her with her many wounds, all the way back to the Middleford residence. 'What is your name?' Lizzie asked, her demeanour back to how it usually was. Sweet and kind.

'You've yet to give me one, my lady.'

'Catherine. Your name is Catherine. It's it pretty? We need to find you some maid's clothes. You can be my new maid!' Lizzie said readily, a bright smile appearing on her face. Catherine returned the smile easily and when Lizzie blinked, there she was, dressed in a maid's outfit with pure white gloves on her hands, hiding the contract sign. She set Lizzie on her feet and knelt down, whipping out a white ribbon, she tied it around Lizzie's neck to the side like a choker.

'Done. Now we better hide that contract mark.'

'How did you do that?' Lizzie asked in shock and amazement.

Catherine chuckled. 'I will teach you in time…'

Needless to say, Lizzie's father was so happy she was home, he let her keep Catherine. Her mother was much more suspicious but she let it slide when Lizzie confided that Catherine was the reason she was alive. Her elder brother was never happier to have her home and simply delighted over Catherine's presence. He was smitten within the first week. Catherine paid attention to her duties but couldn't do much else other than heal Lizzie's wounds unnaturally fast.

'Catherine, I am sending you to the most capable servant I know. Your skills are extremely unsatisfactory. And since my daughter is never to leave your sight, she will go with you.' Frances commanded and no one could say anything. Catherine was simply a terrible maid. She needed to learn how to serve Elizabeth better and who better to teach her than the best butler in England.

Catherine packed whatever belongings she had and helped Lizzie pack as well before entering the carriage. As it moved through the forest and crossed the familiar manor, Catherine realised she had picked a very convenient apprentice. The carriage had hardly stopped at the Phantomhive Manor when Lizzie leapt out with a beaming smile. 'Ciel!'

'Lizzie!' Ciel exclaimed, sounding relieved this time, having heard about her capture and why she did it. Catherine exited the carriage next and Sebastian froze, seeing her ensemble. The carriage drove away and it was only then that Ciel looked up and paled.

'Oh Ciel, meet my new maid, Catherine!' Lizzie introduced cheerfully.

'Nice to see you again, Master Ciel.' Catherine smirked at his shocked expression. Sebastian cocked an eyebrow.

'Catherine?'

'Yes, brother. If you make fun of my name, I will kill you.' She said dryly before breaking out in a grin and going forward to clasp her arms around him in a brief hug. 'I suppose I am Catherine Michaelis now!'

'Brother?' Lizzie stammered. 'Sebastian is a… That means…' She stuttered, visibly upset. Ciel didn't look so good either. He was trying desperately to pretend that Catherine was just playing a maid's role for the fun of it. He was so caught up in his thoughts he was far too slow to dodge Lizzie's quick hands.

She ripped the eye patch from his face. In his shock, his eyes opened wide, proudly displaying his purple contract seal. She stifled a choking sound and fumbled with the ribbon on the neck but managed to undo it, showing off her own, newer contract seal. 'Why would you…?' Ciel murmured, his expression showing hurt. He never wanted this for her. He rounded on Catherine. 'How could you do this to her?!'

Catherine's eyes flashed to red but Sebastian didn't move. He knew that she wouldn't hurt Ciel. 'I hardly knew the fiancée she spoke of was you and it's not like she's worse off than you!'

'You're a demon!' Lizzie confronted Sebastian, betrayal in her wide teary green eyes. 'You, you monster! You're going to eat him?!'

'His soul, yes.' Sebastian answered calmly.

'I've already lost then. I… I just wanted to protect you and make you happy! Now… the contract is useless!' Lizzie cried out in anguish. Ciel rushed to hold her up when it seemed she was going to break.

'That's not exactly true, my lady.' Catherine intervened. Sebastian sighed at his sister. 'With your apprenticeship, if you learn well from me, I can teach you magic strong enough to stay even Sebastian. Just don't command me to kill him. That won't work.' She chuckled.

Lizzie stopped crying immediately. 'Really?'

'Apprenticeship?' Ciel questioned.

'Yes, I'm half demon half witch if you remember. I don't eat souls like my brother though I can… I traded her eternal apprenticeship for her wish. To protect and make you happy.' Catherine said, kneeling down to dab a handkerchief along the tearstains on Lizzie's now determined face. Ciel watched in amazement and wonder.

'Sister, you make my life difficult.' Sebastian muttered, knowing he will probably never get to devour Ciel's soul now. Not with his sister in his way and a soon-to-be Lizzie witch.

Lizzie glared at Sebastian but Catherine clucked her tongue and turned her face back to face her. 'My brother is not your enemy. Not really. He also protects Ciel. Don't be upset with him. We'll be here for a while.' She sighed in exasperation.

'Why are you here? Aunt Frances did not tell me much other than you were coming for a visit.' Ciel put in, relieved that at least his fiancée had not lost her soul though her being a future witch will take some getting used to.

'Mother says Catherine should learn to serve me better. So she sent her here to learn from Sebastian.' Lizzie chirped happily, clasping her arms around Ciel's shoulders and this time he let her. He was smirking at his butler who had a grimace fixed on his face.