Summary: Ever heard of The Jealous Game? Undertaker and Catherine decide to play a little game of it… and Sebastian is too held up by a certain red-haired shinigami to stop it…

'Miss Grell Sutcliffe.' Catherine spoke the name, testing it on her tongue. The mentioned red-head battered his lashes, pleased at being referred to as a woman.

'And to what do I owe this calling? It's not often a witch manages to summon a shinigami.' He drawled in his womanly voice. Catherine inclined her head at the flattery, pacing around him as she took notice of his lean frame.

'I have… a compromise to discuss with you.' Catherine spoke, choosing her words carefully. Elizabeth had no idea the shinigami was here, she was fast asleep in her bed and Catherine had placed protective wards around the room to ensure her safety.

'What sort of compromise?' He asked with slight suspicion.

'I'm going to play a little game with Undertaker.' She began but stopped when she saw the look on Grell's face.

'Now, now, I involve myself with Undertaker because he is a fellow shinigami and a legendary one at that. But to conspire with the likes of the demon-witch… the only reason Dispatch isn't hunting you is because of him.' He maintained and Catherine smiled, showing off her slight fangs.

'I suppose I'll find someone else to occupy my brother.' She sighed mockingly, stepping away from him as if giving up hope. Grell's head snapped to her. 'Perhaps that Hannah Anafeloz.'

Grell's face began to heat up but he smiled, displaying his terrifying pointy teeth. 'I'll gladly distract Sebastian for you.' And there was obvious passion in his tone. Catherine nodded her understanding and began launching her plan.

PART TWO

It wasn't that Catherine was bored or anything. She was just interesting by nature and she was really curious about Undertaker. That guy… he was always smiling, laughing and that was really fun but it excited her when she catches a glimpse of something else. Lust was one. When they were tight in his coffin and his breath on her skin was ragged, the look in his eyes were so intense and his face was… hungry. She shivered.

She collected herself as she thought some more, smoothing down her black dress as she waited for a certain person. She didn't particularly like him but Undertaker hated his guts. She knew because the one time they met, she had never seen her silver-haired Consort so quietly enraged and protective of her. It had made her want him all the more. She grinned devilishly even though she knew he'd try to get her back for this later.

He was good… Catherine had to admit. She couldn't sense his presence at all but she knew he was watching. She put up wards to inform her when he came near. Also her brother's presence was a comfortable distance away so she wouldn't have to worry about him coming here and ripping the men to shreds. Another presence, demonic in nature, materialized in her vicinity.

'Catherine Michaelis.' Claude spoke, masked want rippling in the undertones of his voice. He was just pouring out demonic pheromones, not that they appealed to the demon-witch at all.

'Claude Faustus.' She purred back, lacing her tone with a playfulness that was dangerous. Only because she could feel Undertaker's aura darkening. Excitement, excitement…

She approached Claude in one fluid movement and pressed herself into his chest, draping her arms tantalizingly over his shoulders. His arms readily settled on her waist, sliding further down, letting his fingers play along the soft fabric. She pretended to jump slightly when he suddenly squeezed. She smiled as she sensed Undertaker's aura expanding. Claude could feel it very well and he knew about the game but perhaps he believed he could defeat Undertaker now.

'Claude…' She moaned sensually, nearly laughing with the act she put on. The grip on her ass tightened at the sound and Undertaker was there in the next second.

He didn't say a word. Not a single word. But Catherine felt him all the same. A smooth hand grabbed her wrist not hard but firm and twisted her out of Claude's arms swiftly and into his own. His one arm was hard against her back, holding her against his solid chest and his other hand still held on to her wrist, heating up her hand. She caught a glimpse of his eyes and face under the shadow of his hat. Rage and hate swam in those yellow-green depths, jealousy written clear on his countenance.

'Mine.' He growled, low and possessive, like a quiet lion. He claimed her lips in a dangerous, searing kiss. When he pulled away harshly, she was breathless and intoxicated with his essence. The excitement that being around him caused was making twists and flips in her lower abdomen. 'You're a handful when you play such naughty games, my dear.'

'But you love me all the same, right?' She teased in a breathy tone, her mind still recovering from Undertaker's overpowering essence. He chuckled in response and kissed her hand before pulling away. His usually humorous grin was tinged with something else now that promised retaliation.

Not forgetting the slight details, Undertaker then proceeded to beat the crap out of Claude Faustus for the unforgivable crime of touching the demon-witch belonging to him.

PART THREE

'Grell Sutcliffe.' Sebastian started, exasperated and frustrated beyond belief. 'I am well aware my sister is currently fooling with two men which I plan to murder sometime in the near future.'

'I never said you didn't. But I won't let you through anyway, Sebas-chan!' Grell laughed, grinning with pleasure. The cross-dressing reaper loved nothing more than being in Sebastian's presence. Somewhere in the demon's mind, something irrelevant most likely snapped.

He rushed Grell to the wall forcefully, causing the shinigami to blush from the shockingly close proximity. Sebastian leaned in close, his pointed canines and red eyes flashing. 'I must demand that you use my actual given name, Miss Sutcliffe.' God knows he hated that accursed nickname.

Stunned by Sebastian's bold moves and the heady scent coming off the demon, Grell merely shivered and gave a stuttering 'Y-yes, Sebastian.'

Sebastian smiled. Probably throwing his reservations out the window. 'Good girl.' He whispered. Grell could hardly breathe with Sebastian this close and he had no idea in hell why the demon butler was behaving in this way. Before he could analyze the situation, Sebastian's lips began their assault on his. He jumped for a bit and panicked but Sebastian's lustful scent soon sent him into the same frenzy.

Ciel watched the proceedings with disgust and shut the curtains. He had refused to bail out his butler because he wanted to irritate the demon and it worked for a while but Sebastian seems to either be immensely enjoying his homosexual activity or he lost his mind. Maybe both. Ciel calmly walked to the kitchens, hoping some chocolate will erase whatever he just saw.

Sebastian licked Grell's lips once before pulling back, seemingly calm except for the long slow breaths he was taking, a serene, mocking smile on his mouth. Grell was appalled… yet pleased. His face was flushed almost the same shade as his hair which Sebastian had claimed a lock of, twisting the silky strands between his fingers. 'Tell me, Grell, why exactly are you here?'

'I don't know what you mean.' Grell said breathlessly but his eyes widened when Sebastian slammed his hand to the wall with a loud sound. The demon butler smirked, using the same hand to remove Grell's glasses.

'Lying is naughty… and only good girls get rewards.' Sebastian purred, his eyes mesmerizing the shinigami. He swallowed discreetly.

'Catherine said I'm just supposed to occupy you.' The flustered man got out of his throat. Sebastian smiled, pleased.

'I see. So she believed you could occupy me.' Sebastian spoke with emphasis, pressing up to the shinigami in a dangerous manner. 'She set you up as well, Miss Sutcliffe.'

'S-Sebastian?' He stammered timidly. He was flirty but never so overly… forward.

'It is I… who plans to occupy you.' The demon said with a smirk that sent adrenaline coursing through Grell; his fate was sealed.

PART FOUR

Catherine was extremely smug but she was cautious too. Undertaker would try his best to get her back for that Claude stunt. She had come to bail out Grell afterwards only to find his red coat discarded in the garden and suspicious sounds coming from her brother's room. Success as expected. Ciel rushed out with a tortured face, demanding that he pay a visit to Elizabeth. Of course, she couldn't expect a child to deal with that.

She found it fairly amusing that Grell's moans and pleas alternated between male and female tones. Sebastian didn't complain about her methods so she'd probably do this again. A couple of weeks later and she truly believed maybe… he surprised her again by not taking vengeance. It made her feel guilty for her stunt. Slightly. She was part witch and witches never claimed to be emotionless. She went to Undertaker's shop, ready to walk in when she heard it.

Undertaker moaned again. 'Such a tempting look on such a cold face, my dear. The dead make pleasing lovers.' He hushed. Catherine gritted her teeth. What the hell was that? The sounds repeated. 'Don't worry, my dear. We'll work that rigor right out of your body.' Undertaker's voice hushed once more. She cursed her heightened sense of hearing.

'And what a succulent body it is… grey with death…' He continued to murmur in a voice that brought out excitement in her in different circumstances. An exceptionally loud and sensual sound emitted from the door. Catherine's hands turned to claws.

Yes, once upon a time, she was watching Undertaker dance with a skeleton but when he had leaned in to close to the skull in such an intimate way… well, he only had a split second to blink before he realized a very furious demon witch had reduced said skeleton to ashes. No woman could make her jealous like a dead one. The power of necrophilia…

Now, she slammed the door open and lunged. She knocked a shirtless Undertaker into one of his coffins, growling with her sharp canines prominent and demon red eyes glowing. Then she noticed… there was no corpse in sight. Undertaker giggled, revealing yellow-green eyes of mischief. Catherine slammed his shoulders to the back of the coffin harshly.

'Did you want to die?!' She hissed in anger, jealously burning in her countenance.

'I got you.' He chuckled, grin widening.

'I realized, you damned necrophilic mortician!' She snarled but jumped slightly when the casket shut with an ominous sound. 'Undertaker…' She started warningly.

'Are you so very jealous, Catherine?' He asked teasingly, wrapping his arms around her and completely ignoring the dangerous aura engulfing her.

She smiled widely in the darkness and gripped his pale shoulders. 'Yes, I am. And you are going to pay for it.' She finished, crushing her lips to his in a painful bruising kiss. Undertaker loved it.

'I welcome it, my dear.' He whispered and her hands and nails wreaked havoc on his body.

PART FIVE

Catherine opened the coffin lid the next day, climbing out and grabbing her dress on the way. Undertaker leaned one lean arm on the edge, displaying his naked body to the shop and the only one in it. He grinned and pushed his hair back with one hand and chuckled, making a sated demon witch turned back to him, running her eyes over the damage done. His pale skin was littered with injuries right alongside the scars that crisscrossed his body and matched the ones on his face and neck. There were red marks on his shoulders and sides where she bit him and long crimson trails mad by her nails. His hips and his back if she had asked him to turn around were covered in bruises created in her lusting fury.

'My dear played so rough with me…' He sang smugly, quite satisfied. His plan followed through perfectly, though his body ached with his lover's possessiveness and his flesh marked with her claim. He adored it.

She blushed and turned from him slightly and he caught a small amount of guilt shining through her indifference. 'I-It's your own damn fault! You know how I am with you and necrophilia.'

'I know very well.' He admitted, stepping out of the coffin silently and grabbing her from behind gently, forcing her to his bare frame. Her face grew hot. He leaned down till his silver hair tickled her face and shoulder and whispered. 'So tell me, my dear, who do I belong to?'

'You're mine.' She hushed back with a forceful edge. Undertaker licked the ridge of her ear, pressing her to him tighter.

'Exactly. So claim me.' And she did.