Olivia wasn't quite sure what made her look out into her apartment building hallway. Maybe because she was so hyper aware of her surroundings since William Lewis. She peeked out to see a dark haired woman but she was moving so fast she couldn't see her face. There was something familiar about her. After the third or fourth time of this woman pacing in front of her door, Olivia instinctively grabbed her handgun and shifted back toward the door. The woman made a move toward her door so she swung it open as fast as she could and raised her firearm. What came next made no sense to Olivia. Was this some sort of trick? Was there some mirror or light play going on? Was she dreaming? Her eyes just continued to widen but she was frozen in place.

"Woah!" the woman said, she even sounded like her. The woman put her hands up to show she wasn't armed or a threat and that's when Olivia realized she was still holding her gun on her.

"Oh," Olivia said, lowering her weapon and staring at this person in front of her.

"Ok," the woman began, "I know you're probably completely freaked out right now, I would be too."

"You think?" Olivia said, her voice cracking, "I have some strange clone woman at my door."

Emily chuckled. She knew this wasn't the time for laughter, but she couldn't help but laugh at the absurdity she knew anyone else would be laughing about.

"I'm Emily." She said, holding her hand out. Olivia didn't take it right away but noticed Emily grew uncomfortable so she shook the woman's hand slowly and then quickly withdrew her hand.

"Olivia." She stated, not really sure what else she should say or ask.

"I know," Emily said, smiling, "I'm your twin sister."

"My what?" Olivia said, leaning against the door frame before realizing they were still in the hallway outside her apartment, "Would you like to come in? I'm assuming you're not here to kill me?"

Emily laughed again and tentatively followed her sister into the apartment.

"No, just to meet you, I promise." Emily held her hands up again as a sign of peace before fully entering the living room. There were coloring books and toys sitting on the coffee table. She knew Olivia had a son based off of a news story she'd found. That reminded her that she'd brought a gift for her nephew.

"I brought this for your son," Emily said, her hand shaking as she handed the gift bag to Olivia, "I wasn't sure if you'd gotten it yet, it's a book that just came out about a moose. It's actually pretty good."

Olivia took the bag and looked inside to see an innocent blue and yellow book.

"So, would you like to sit down?" Olivia asked, gesturing towards the couch as she walked to the kitchen, sitting the gift bag on the counter, "Would you like a drink? I have coffee... wine?"

"Oh, no thank you," Emily said, sitting slowly on the couch, "Um, maybe some water?" She hadn't really eaten or drank anything since she left her apartment. Her throat was still scratchy from the dry plane air.

Olivia pulled a glass from the cabinet and filled it with filtered water from the fridge door.

"So," Olivia started, walking to the couch and sitting down next to Emily, gently placing the glass of water on the coffee table in front of her sister, "How... when did you find out?" Olivia wasn't usually the one fumbling through her words, but she still didn't know what to think let alone say.

"Last week my mom passed away from a stroke," Emily said trying to hold back the tears, "She told me I was adopted and gave me my real birth certificate." Emily cleared her throat and pulled out the folded document from her pocket and handed it to Olivia.

Olivia unfolded the paper to see Emily Marie Benson in the name section. Aside from the weight being a few oz off and the time difference, this was basically the exact same as her own birth certificate. She had seen the twin box checked but all these years thought it was a mistake or something. She used to joke with Elliot that she had some twin out there somewhere. If only he could see what was unfolding on her couch.

Emily's voice broke the silence, "It was pretty simple to find everything once I had my birth mother's name, though I'm sad to find out she passed away already. I'm sorry."

"It was years ago, she fell down a flight of stairs," Olivia said shakily, she left out the drunk part because she didn't want to taint her sisters view of her birth mother.

"I read she was drunk," Emily said, "Was that often? Because she was raped?" Olivia looked at this woman. She really did do her research.

"Uh, yeah," Olivia said, "I was... we were the product of her rape, so she drank to cope with seeing me everyday, reminding her."

Emily immediately felt guilty. She had to admit she'd felt some resentment towards her sister because their mother had kept her, but now she was almost certain she didn't have it so great growing up like Emily had imagined. Emily wasn't quite sure why she was starting to hold her breath, until she realized Olivia had mentioned their mother was raped. Emily was still going to therapy for her own that had happened just a year before. She slowly released her breath, hoping her sister didn't notice.

"So," Emily said, breaking the silence, "You're a Lieutenant?" She had read about her sisters climb through the ranks and she was slightly jealous.

"Um yeah," Olivia said, "I'm Lieutenant and commander of Manhattan SVU. The one-six."

"I'm a detective too," Emily stated, though she hadn't climbed the ranks like her twin.

"Wow," Olivia said, "What are the odds that we both went into the same line of work?"

"That's exactly what I thought when I found out," Emily said, smirking at the fact that, even though they hadn't grown up together, they still had the same line of thinking.

Olivia was about to ask what kind of detective she was when Noah came bounding in and jumped on Emily's lap.

"Good morning, Mama!" Noah said, wide awake and giggly.

"Oh," Emily said, looking down at the wavy brown haired boy in her lap, "I'm not..." she trailed off, not sure what to say. She hadn't thought about how strange it would be for him to see two of his mom.

Olivia cleared her throat and Noah quickly turned his head towards his mother, then back to Emily.

"Two mamas?" Noah said, confused as he stood up.

"Noah," Olivia said, "This is mommy's twin sister Emily, she's your aunt. Mommy just met her today." Noah climbed into Olivia's lap, still looking from Olivia to Emily. Olivia wasn't sure how he was going to react.

"Ok." Noah said quickly, smiling, "Hi, Auntie Emily."

Emily was completely sure her heart exploded in her chest.