Meredith Grey arrives in New York for a prestigious six-month rotation at Mount Sinai with one goal, graduate from medical school and keep everyone at arm's length. After a painful betrayal, she's sworn off letting people get too close. Then she meets Dr. Addison Montgomery. Addison is brilliant, elegant, and one of the most respected neonatal surgeons in the country. She's also married. What begins as long hours in operating rooms and late-night conversations turns into something far more dangerous as admiration gives way to friendship, friendship gives way to longing, and the line between right and wrong becomes impossible to ignore. They only meant for it to be temporary. Until walking away becomes the one thing neither of them knows how to do without breaking.

Derek And Meredith are in love And Then Addison or 'Satan' Shows up.... And well a plot twist Indeed. ( TW Abuse, SH and just any Sensitive topics in general xo) - STVR

Addison Montgomery is an assassin with an impressive kill count who has never been caught, much less suspected of any crime. She is good at what she does, but she's not a monster, at least not in her eyes. She followed her own personal code of ethics, taking jobs with the mission to wash the world of filth. When she gets a contract to kill misogynistic neurosurgeon Derek Shepherd, Addison begins stalking and getting close to his wife, Meredith, for information that will help Addison succeed in her mission. What seemed like a typical job no longer seems so typical after Addison first lays eyes on Meredith and immediately becomes obsessed with her. As Addison further intertwines her life with Meredith's, weaving her into her web of subduction, the stakes become higher than ever when Addison no longer cares about killing Derek for the money, but for a much sweeter payment: Meredith all to herself.

Ever since Meredith was a little girl she had dreamt of finding her soulmate. Her mother had always told her that soulmates do nothing but cause pain and instead of daydreaming about love she should be focused on being extraordinary on her own. Despite her mother's warnings, the blonde couldn't help but trace the intricate design of swirls on her upper arm and imagine what they would look like when she touched her soulmate for the first time and the harsh black swirls would turn to color. MerAdd soulmate AU

Meredith walked around the park in a daze, the train of her wedding dress dragging behind her in the dirt as her mind swirled with a million different thoughts and emotions. She could not believe that she just did that. She told herself that she was going to marry Derek Shepherd and she had every intention of going through with it, but when it came time for her to say 'I do.', the blonde realized how much she did not want to marry Derek. As she looked around the church at all of their friends, family, and coworkers she realized that instead of feeling happy, she was embarrassed. Meredith felt like a fool standing in the front of a church in a floofy white dress. She didn't want this, she wanted Addison. A vignette of Addison and Meredith's two year long affair and what happens after the blonde leaves Derek at the altar.

Addison finds out that Meredith uses age regression as a coping skill and takes her home to her and Arizona's house to care for her. I promise the story is better than the summary, I just suck at summaries most of the time!

Meredith is in her final year of medical school when she meets neurosurgeon Derek Shepherd in a bar. Her life filled with the controlled chaos of hospitals takes a dark turn when she is abducted and held captive by the perfect stranger. As she struggles to find her way back to herself, an unlikely bond forms with her captor's ex-wife, who becomes her lifeline in a world of chaos and despair. Together, they navigate through the shadows of trauma and healing, discovering solace and love in the most unexpected of places.

Addison gets called into work causing Meredith to act out. Addison is not willing to let her girlfriend get away with being a brat.

Meredith and Addison have an affair while the redhead is still married to Derek.

Meredith wasn't his anymore and it was clear that despite still being married, he didn't want Addison anymore. What better way to make Derek understand the humiliation and rage she felt every time he followed Meredith around like a puppy dog than to just take the blonde for herself? The devil on her shoulder was winning out, not caring who got hurt in the process. Fed up with Derek's obsession with Meredith, Addison seduces the intern herself. What happens when her plot for revenge leads her to falling in love with the very same woman her husband wants?