After Jaime kills the King, he was removed from Kingsguard by King Robert. He was sent to Casterly Rock to be the heir when he marries Ser Addam Marbrand's sister, Lady Marissa Marbrand. They have a daughter, Lady Cerene Lannister. This story takes many characters to become OOC and the events will lead into an AU. WARNING: It may contain rape, violence and more mature contents. Please don't read if it is not your cup of tea and I might butcher some famous characters too, just for story's sake. I am exploring the possibilities of events that could have happened with an OC as a Lannister. Have a nice read and pour in your inputs.

Cerene Lannister

The scent of a fresh book in her hand, brought back the sweet memories of her time spent with uncle Tyrion in the Rock. One could hide and never get caught in the seven floors of the library tower in Casterly Rock. Most of the days she had hid herself dwelling in the books trying to read even the meaningless words, to forget the creeping loneliness. The pages in the fresh book that laid before her had become so thin that it would soon get torn if not tended, in this small library. This might not be the smallest library per se, but everything appeared tiny before the Rock. Her eyes vaguely took note of the complete library, to discover the servants of Ashemark had been too busy to even tend the books, as dust had taken a layer. She wouldn't blame them as she knew the least of all place men would visit at the time of war would be a library.

War... She wished to close her eyes and open to find herself back in the Rock, where she could smell the fragrance of flowers in the garden and sneak into the prisons in the bowels where the dangerous of men were arrested just to feel the thrill in breaking the rules. Obviously, uncle Tyrion would always keep an eye on her and she never got lost, but she just wanted those carefree old days. She wondered if uncle Tyrion would be thinking of her in King's Landing. When the news arrived that Uncle Tyrion was captured by Lady Catelyn Stark, she remembered how her grandfather's green eyes, with a speckle of gold, same as hers, narrowed enough to kill the Lady Stark even from the Rock. He didn't utter a word to anyone around, even to the Maester Creylen who gave profound counsel when needed. Although her grandfather never needed counsel, as he ruled the Seven Kingdoms to prosperity in the Mad King's era, becoming an uncrowned King in his own right, he was so calm that day. Storm comes only after a calm.

The dreadful news of her sweet uncle Tyrion being captured in the hands of an enemy who wrongly accused of harming a boy - which Cerene knew her uncle would never do, shattered her soul. She prayed that night to the Strangers, crying in the Sept, to kill all the enemies and bring back the man, who was her protector and guardian than her own father had ever been. There was no denial in accepting that her family was imperfect and she had been too close with uncle Tyrion to know he was a Lannister through and through, having some faults of his own. But he would never dare harm a child. He was too clever for such easy foul plays.

The Stranger had almost granted her wishes when her grandfather summoned upon the Mountain that rides. She was so excited in the beginning, thinking of how the huge beast of a man would ride into the enemy's camps and take her small uncle Tyrion on his back like a hero and return to the Rock with cries of victory for upholding the justice. It was only a year before, when she had thought the stories like those mentioned in the songs were all true, where knights rode to save the innocents and slay the monsters. Now, she understood every heroes have a monster living inside of them, or in the Mountain's case, it was always a monster but a loyal one at that. Remembering the gruesome accusations that were presented in the court of the Rock of the crimes that the Mountain committed, shuddered her heart even now. She didn't want to recollect them. Let them rest.

Her grandfather called her one day to his solar, which either meant she was going to get berating for not learning the required skills to run a Kingdom in future or to give his peace of mind in educating the Lannister legacy that would be carried through her womb. Even though he never openly had spelled out the word, his motivations never flickered. It was one of the rarest times, when she used to be proud of having Jaime Lannister as her father, who strictly swayed away any man who dared to come with a proposal of a marriage with her.

When the war begun,

Lord Tywin had a massive solar on the West tower, built and furnished almost in gold. The gold armor that lied in the farthest corner, never failed to attract her attention. His gesture to her had been kinder than how it had been for uncle Tyrion. His golden flecked green eyes took a proper measurement of her whole appearance before him. "Do you know what this war means?"

His words were always sharp and careful, making her to think more than it required, as she didn't want to give any wrong impression that she was a foolish girl after all. "You will bring back Uncle Tyrion by destroying the enemies." His mouth twitched in disappointment, of her silly answer. 'Stupid Girl...' She chided herself.

She was desperate to impress him and make a mark of her presence, to get appreciated at least once, which seemed to be rather a difficult work than taming a lion. At least she had come a far way closer than uncle Tyrion, getting a approving nod every now and again, which in the world of Tywin was itself as well as applauding. She put her mind into the question and sought for an answer that Lord Grandfather would approve. "To teach our enemies a lesson and set an example before everyone, making them understand what will happen if they ever touch a Lannister."

Tywin gave one approving nod, and she knew she had passed the test. "Do you remember your duty for this family, Cerene?" His voice was deep as he picked up some parchments still looking her through the corner of his eyes, to catch her reaction.

She had been trained for this, since she bled, by the Septas. 'Love your husband, no matter who he is and spread your legs to bear his children.' - The never-ending lessons of the Septas had etched into her heart like a sweet summer song, that she would recite without missing a line again if needed. "I remember, Lord Lannister." She straightened her back to give a sure reply.

"Jaime refused to marry again after your mother died. I couldn't sway him away from his decision. Your lady mother barely lived with him, just for one year. He never listened."

"He is your son, my Lord. Just like you, who didn't remarry either." She spilled the words and immediately felt a gaze from the roaring lion to shower daggers on her, a moment later, making her to regret of opening her mouth.

"Indeed... But unlike him and me, you are in your prime, ready to be wed, whose sole responsibility will be to carry the Lannister name further. I know your father had been rejecting to all perfect houses, but it will not last long. When this war gets over, we will reward the house who will prove their loyalty, by marrying you. Do you understand?"

She nodded her head in approval, understanding the reason why she was called. Lord Tywin was undermining her father by intimidating her, so she would soon convince Ser Jaime Lannister for a marriage. Little did he knew, her father, Ser Jaime Lannister, was not an easy one to take back his decision that he decided upon. Her heart was desiring to meet her father, even after all those years.

"Go on... Ask" Tywin commanded as though he could sense her hesitation.

"When will my father come?"

"What do you think?" He retorted.

And for that question she didn't want to answer and make herself proud. All the empty words that she would remind herself, by facing the reflection glass every day morning, gave no self-will to submit to the truth that her father never loved her. If he had, why would he leave her in the Rock and go to King's Landing, to be merely a Lord Commander of the City Watch. "Never... He will never return." She said bitterly and raised up to leave.

Just as she was about to exit her grandfather's voice echoed. "He never learned... to do his duty. You will learn from his mistakes and never repeat the same. But… you must also know, he loves you and he does everything for this family."

She swung her head to see Lord Lannister's unfaltering gaze that questioned her own sanity. Tywin was never a man of words, let alone express comfort. He believed in hardship and toughness to teach his children very harsh lessons. But that fine moment... which only lasted for mere minutes, she realized he cared for everyone too, even for uncle Tyrion, else why would he be waging war?

"Come back soon, grandfather..." She said slipping a polite smile and moved back to her chamber with Ser Willem with her side.

Now,

Ser Willem approached in his full clad armor, as his boots scraped against the marble floor, announcing her gallant guard's arrival. "Lord Marbrand is asking for your presence, my Lady."

She leaped out of her chair rushing to the door, hoping with her life to hear good news for once... just once. Her long crimson dress ornate with golden thread trailed her maternal grandfather's solar, as she ran inside with worries itching her soul. Lord Damon Marbrand was no Tywin Lannister, not even anywhere close in behavior or demeanor. His smile was his charm that captivated his men to follow him even to the deathbed. But he didn't smile then, his face haunted with deep worry.

"Is it my father?" She screamed imagining all the evil things the Young Wolf could have done to get revenge for his father's death. It was Jaime Lannister, the lion of Lannister. Even the Young Wolf wouldn't dare. "Did... Is my father alive, grandfather?" Tears welled on her emerald eyes, worrying if she had lost the last of parent forever.

Lord Marbrand shook his head, assuring her strongly that nothing had happened to her father. She sat on the chair nearby burying her head into her hand, as the somewhat easier news dwelled in, to soothe her soul. Her grandfather's hard callused hand comforted her head, as he kneeled before her. "No one can touch your father, Cerene. He is the lion. Don't you forget that!"

She wanted to get lost into the comfort of those poetic words. But the lion was caged by the Young Wolf, beaten and starved for fighting the enemies and traitors who broke their oath to overthrow Joffrey - the one true King. "What does the raven bring?"

"Dark wings, Dark words." Lord Marbrand, a gallant old man, with gray hairs but strong built, father of Lady Marissa Marbrand - her mother, pulled a chair to sit next to her. "The wolf boy is marching to the West, Cerene. If the words are true, he is planning to take the Rock."

Her heart almost lost a beat hearing to that dreadful piece of information, as she stared at the Maester Cullen and at her grandfather. "He can't take the Wester lands. Can he?"

"The Golden Tooth is impregnable. There is no way he can take that. Just a foolish green boy with dark motives. We can throw him back easily." The charm remarkable smile of Lord Damon returned bringing her into the comfort of being home - her mother's home, where she had spent some fine years playing with the girls and her uncle Ser Addam. Yet, those comfort words were nothing but lies. Everyone lost underestimating the Young Wolf thinking him of just a green boy.

"The foolish green boy captured my father. He managed to hold even Lord Tywin at bay."

"Ser Stafford Lannister is holding Oxcross with almost twenty thousand men. The northerners as a whole are not even that strong. Do you think he will win this time?" He raised a question that almost convinced her.

"Let us not forget that they are untrained sell swords, grandfather." She countered making Lord Damon to second guess on his confidence. The Young Wolf never faced Tywin Lannister in the battlefield, yet he was winning the war.

"If I may, my Lord..." The Maester Cullen approached daintily to offer his wise counsel. "If the Young Wolf takes the Westerlands, the risk is much higher, my lord. All the Westerlanders will want to come here take back their lands."

"Be that as it may... We are in no position to fight the Young Wolf by crossing the Golden Tooth. Lord Tywin's orders were very clear when he mentioned no one to forward an attack, for your father's safety." Her grandfather scowled unable to let go of the spiteful feeling for the Starks.

"War is not won only with swords, my Lord." She announced gathering her skirt while raising up. "Some are won with words... And some with women." She declared and glanced at the Maester Cullen intrigued to try something dishonorable, that she had read in one of the war details followed in Yi Ti, in the library of Rocks.