Just my take on the Addek break-up, and what happens after.
"If you go now, we don't have a chance. We don't have a chance if you go now. If you go..."
Addison had watched as Derek opened the door and stepped out into the dark, rainy, New York night. Her clothes still lay strewn across the concrete steps of their brownstone place, absorbing the rain and giving a clear indication about what was going on to whichever nosy neighbour was peering down at the raucousness on their usually quiet street. She steps forward quickly, stopping as she reaches the threshold of their door. Looking out, she can see him walking away; his beige coat now a dark shade of brown, his head hanging low as he heads towards the City.
"Derek, please!" She calls after him, but her words fall on deaf ears as he ignores her and carries on walking. He turns a corner, disappearing from sight, and her clenched fists raise to her mouth as she tries to subdue her cries. Barefoot, she steps out and down the stairs, gathering her clothes before going back inside, closing the door and throwing them down on the hardwood floors.
The house still smells like the ravioli she had made them both for dinner. Had been making them for dinner. Addison had proudly followed the recipe exactly, even making her own pasta. Folding the sheets over the beef centres, she presses the edges together firmly, before laying them on a plate. They needed to be cooked for ten minutes on the hob, when Derek arrived home. She washes the cases with egg yolk, and washes her hands in the sink before washing the counter down.
The redhead turns her head when she hears a knock on the door, and glances at the clock. It was too early for Derek to be home, and even if it was him, he had a key. She wasn't expecting anyone, either. When she had called Carolyn to get the recipe for Derek's favourite dish, she had told her that it was a surprise and they needed some time alone. Carolyn had gotten into the unwelcome habit of dropping by recently; blaming it on her age and her desire to see her only boy and his wife.
They'd accept her into their home happily, of course they would. They'd be all smiles, and little touches here, and smiles and shy glances there. As she made dinner, Derek would walk past and snake his arm across her waist, before leaning forward to kiss Addison's cheek, telling her that her cooking smelt lovely as always. Carolyn would sit at the table with her glass of wine, and smile happily; sated in the knowledge that her son had found a good woman, and they loved each other just as much as she and Derek's father had.
In reality, things couldn't have been more different. Derek and Addison hardly spent any time at home together. Their marriage was crumbling as easy as the gingerbread house Addison had tried to make at Christmas; but neither of them wanted to admit it. The elephant in the room, the weight that rested on both of their shoulders, and propelled them both to drive themselves into their work at the hospital.
So the knock at the door was the catalyst for Derek and Addison to accept their fate, and move forward. It wasn't something she was prepared for, or something she ever expected, but when she opened the door and strong arms enveloped her as new lips found hers, Addison found herself being swept away with emotion.
She had resisted at first, but as Mark picked her up and kicked the front door shut behind them, she found herself relenting, and soon her fingers were sweeping through his hair. Her legs were wrapped around his waist, and the pasta had long since been forgotten.
Upstairs, as he laid her on the bed and crawled over her mumbling words of adoration, her arms moved to pull his shirt from over his head, and were soon working at his belt buckle. She briefly thought of the nights that she and Derek had spent in this bed, saying goodnight and rolling over to go to sleep.
It had been so long since she had felt the presence of a man on top of her who was able to make her feel like this. Her heart rate was elevated, and endorphins flying through her body as she looks up at Mark, eyes full of lust.
It wasn't long until they were both naked and moving together beneath the thousand-count sheets. Mark had entered her and the redhead had moaned, which just spurred him on. Setting a rhythm, Addison wrapped her arms around his neck, and flipped them both; so she was straddling his waist. Her hands were resting on her thighs as she rides her husband's best friend, close to her orgasm; and it's only with the creak of the bedroom door, that both Mark and Addison turn their heads and see Derek standing there.
They both stop immediately, Mark's hands resting on Addison's hips, and Addison pulls the sheets up around them both. Derek says nothing, and turns in the doorway before retreating down the stairs. He pours himself a tall glass of whiskey, and drinks it down quickly, before refilling his glass. He can hear fumbling upstairs; his wife's voice telling Mark to leave and then there are footsteps on the stairs, and the closing of the front door.
He finishes his glass and sets it down on the table before heading upstairs, barging past Addison who had since pulled a black t-shirt on and who was now trying to explain what had happened. Derek knew what had happened, he wasn't an idiot, and as he gathers up an armful of her clothes and heads downstairs, he ignores her pleas for him to talk to her.
Opening the door, he throws the clothes out with force, before throwing Addison out, too. As he closes the door, her hands are pressed against the frosted glass and her wails are loud and constant. Hanging his head, he tries to gather himself. Sure, this was their home; but he couldn't throw her out, and leave her with nowhere to go. Addison's relationship with Bizzy and the captain was tumultuous to say the least, and at least he had his mom's place, and Nancy and Liz's, too, if he needed somewhere to go. Amelia was away at med school anyway, not that he'd go there first; she and Addison were too close, and he knew she would just take Addison's side in this.
He steps back, and opens the door again, revealing the redhead, soaking wet and in tears. "You stay, and I'll go," he tells her, and as quickly as that, he is walking down the street. Away from their house, away from Addison; away from their marriage.
The neonatal surgeon sinks to the floor behind the door, her head held in her hands as she cries and curses herself. She loves Derek. She loved Derek. And now Mark had to come in and mess all of that up. That wasn't her, it wasn't right; and now she was left in this house, alone.