A Cruel calculating women

Obviously a lil longer as i truly begin the story.. This is my first time writing a Cruel Intentions Kathryn/Sebastian fanfic so let me know how im doing. I appreciate reviews.
Ps: Oh obviously does not belong to me cept the plot and whatever aint from movie:) Thanks

Why the hell do I bother?
Kathryn Mertuil strolled into a townhouse she hadn't been in in almost two years with the confidence of a girl who owned the world. A cold smirk spread across her lips as she headed directly to her room, already knowing there was no one to greet her. Her mother and Sebastian's father were as always on a trip, somewhere in the Caribbean most likely.

Kathryn found a note sitting on her bed when she entered the roomand carefully slit open the envelope. It was from her mother.
Kathryn
I will arrive home tomorrow and we will attend the wedding of your stepbrother together.
Please try not to cause any trouble this time.

The cold smirk that sat so casually on Kathryn's face slid off as she saw and read her mothers note. It was obvious that it was her mother that had sent that wedding invitation to her, simply to throw in Kathryn's face another thing that she wasn't any good at, whether it was getting married or Sebastian, probably the former. Her mother was crueler than her, who else was she to of learned from.
The wedding invitation sat on Kathryn's dresser and as she saw the gold writing on the front spelling out Sebastian's name, she couldn't help but harden her features in response. Taking out her cross, she snorted a bump and in regret headed across the hall into her dear brothers room. The same as always, even his books still sat on the shelves and his desk sat off to the left.

With a loud shriek, Kathryn chucked a glass paperweight from off his desk across the room. "Fucking Sebastian."

Disgusted with herself for sinking into unwanted memories, Kathryn quickly returned to her room already planning out her welcome back and the revenge she will reap on her brother for betraying her. That country bumpkin's going down. Once I'm done with Sebastian he'll be utterly ruined, Annette won't want him and he'll still be just a Toy.

Sebastian awoke with his one arm slung around a still sleeping Annette and the sun shining brightly into his face. With a groan, he climbed out of bed and headed to the shower. When the hot water hit him, he sighed and remembered today he was getting married. Sure he loved Annette but he didn't really understand why he had proposed in the first place. He like Kathryn use to believe he was above these feelings and meaningless events. After all it was proof through his own father that none of this mattered. So why the hell was he getting married to a girl that he had met because of a bet?
Sebastian heard Annette stirring and only waited seconds before she climbed into the shower and grabbed his head locking her lips onto his. It turned out Annette enjoyed sex as much as him and was already reaching down to his hardening cock when through the steam, both turned in the direction of the phone ringing.

"Damn It. Take a shower, I'll get it." Sebastian muttered as he swung a towel around his lean hips and gave Annette a sweet peck on the lips.

"Love you." She replied as he left the room.

Sebastian picked up the phone and was immediately greeted with Tuttle's cheery voice. "What do you want this early in the goddamn morning Tuttle?"

"Whoa, easy sunshine, guess I should be glad I aint the one marrying you. Thought you might like to know you dear sweet sister is back in town." Blaine said knowing Sebastians mood was probably just ruined.

"Fuck you." Stated Sebastian as he hung up the phone. There was no way that that bitch would come back here, and if she did she picked the worst possible time. "Unfucking believable." Sebastian muttered quietly.

Carrying a glass of brandy, Sebastian made his way out onto the bedroom balcony. He barely heard the cars and noise of people below him, he was too stuck in the memory of the last time he had seen her. 'Silly rabbit, my triumph isn't over her, It's over you.' Sebastian sat there confused by the words coming out of his beauty's lips. A cold malicious smirk, the one he loved to see turned on people was now turned on him as she spoke those harsh words. It had been that last encounter that drove him to Annette, to show Annette his journal. The bet had ended crueler than he expected as his heart was ripped out. Knowing her vengeful side, Sebastian's face turned to stone at her words. 'You really did love her, but it amused me to make you think you hadn't.' Hatred was all he felt for her in that instant as she told him 'you were just a toy Sebastian, a toy I liked to play with.' Now he truly hated her. If she was to appear again, Sebastian would be more than tempted to hit her, somehow break that icy veneer she always wore, to see if she too could bleed. No, Kathryn doesn't feel, not for anyone, she was the true Ice Princess and only gained joy from breaking others. He wasn't her toy anymore though and there was no way she would dare come out to play, because this time he would break her.

Two of a kind were the words he had once said to her. Sebastian had believed them completely just like he had loved her. It was all just a game with her though, even me. Emotions were for the weak, something they were both far above as they schemed their way through high school ruining anyone's life that crossed them or ruining their life just for fun. No one would of guessed that the forever playboy and the ice princess were the ones fucking with their lives. And in the end, Sebastian had been only a Toy for her as well, just like all the others. All we ever did was play the game, never realizing we were the ones we were ruining, and any chance of being together. If she was back, though... maybe it was time for one last game. The trademark smirk appeared on Sebastian's face as he returned back inside, to fuck his fiancée.. to get her out of his mind. 'I still fucking love you, worthless cunt. You'll pay'

The game would start today. Dressed in a low cut black dress with a slit to the thigh and heels that laced up her shins, Kathryn arrived at one of the Valmont's estates in the country, where the wedding would take place. Already Tiffani had left her, which was exactly what Kathryn wanted as she would make her presence known at the perfect time. No emotion showed on her face as Kathryn smiled at other guests. Below the icy veneer though her blood boiled with anger at the mistake Valmont was making. He had ruined it. He could of stayed, and they could of schemed together but no he had to go off and fall 'in love' with fucking Annette, so now he had to pay. He had to be taught a lesson when it comes to betraying the ones your suppose to stick by. 'Asshole'
Kathryn took a deep breath and headed to the washroom. She needed to wait if she wanted this to work, and already the guests were being seated. Thanks to her lovely mother, she was in the second row. 'Well it could work to my advantage though' A grin spread across her lovely lips as she shook her brown hair back and went to start the game. 'Poor weak Sebastian, see what falling in love gets you.' I only do what I have to do, and this, my dear has to be done. This time you'll be the one that bleeds.'

...
The guests were seated, the wedding march had played and the traditional words had been spoken. Everything was going perfect as Sebastian and Annette stood in front of family and friends about to promise to be together for ever. Sebastian though he stood with a smile was unbelievably bored and wished for something to drag him out of his misery. Sure he loved Annette but really what the hell was the point in this? He may have proposed but he still didn't get it.
Kathryn stood back and watched. She could read his eyes even from the distance and seen the need in them for a little fun. Oh he had missed her even if he did deny it. He missed the times he spent with her, the days he would watch her and the nights she climbed into bed with him, just to feel safe. Their relationship had been like no other and now as she stood here about to make her entrance, she knew it would never be that way again. Kathryn was probably the only one that knew him completely and truly, just like he knew her. She saw the hatred for such displays in his eyes and posture and the smirk and sinister laugh that spoke of a horrible joke that was dying to come out hid behind his features of joy. 'Oh Sebastian,'