"What is this concerning?" Ryan asked as he led Olivia over to his couch in his living room. The room was filled with antiques and looked very presentable and rich. "Sit please"

"Thank you" Olivia nodded a little as she sat down on the brown leather couch, She felt sort of uncomfortable in the presence of her father in-law and he had no idea who she was. "It's about Alyssa Moreno, your DNA was found by her body"

"Oh yes, I heard about her death, but it's not what you think detective"

"Fill me in please"

"I dated her for a while then we broke up, two days ago we ran into each other and sort of had a…one night bonus…you know…no strings attached" Ryan said sort of uncomfortably in front of the young detective.

Olivia nodded a little extremely uncomfortable talking about sex in front of her husbands father "So you two had sex and then what?"

"Well I went home and she said she was going to her sister's house and then I don't know. I got home around 10 and went to bed"

"Do you live alone?"

"Well my dog can give you my alibi but I don't know how presentable that would be in court" Ryan smiled a little.

Olivia smiled seeing he had the same sense of humor as Mark "Mr. Vaughn does the name Lilly Anderson mean anything to you?"

Ryan's smile quickly faded "Well…long time ago…but yes I know that name"

"Did you know her husband Marcus Anderson?"

He nodded "What does have to do with anything?"

"Just that your name came up in that case as well"

"I thought that case was closed, murder-suicide"

"It is but…" Olivia thought for a second and knew she shouldn't have done it she had to "Some evidence came up that suggests that it wasn't suicide on Mr. Anderson's part"

Ryan just looked at her and shook his head "That's impossible, I mean Marcus was an FBI agent but the way he treated Lilly and the kids was nothing good"

"What kids?" Olivia quickly asked trying to bring in that subject.

"Lilly's. Did you want anything to drink?"

"No I'm fine thank you."

Ryan nodded "I believe she had three kids, Max was the oldest, Kristin and I believe her youngest who was five at the time of her death but I can't remember the child's name it was long ago"

"Mark Anderson" Olivia answered with a small smile "I think it was in the file"

"You know what? I do think that was the name, such a shame that he witnessed the death, no child should go through that"

"I agree" Olivia nodded a little "Were you and Lilly ever…intimate?"

"Detective a gentlemen doesn't kiss and tell"

"I'll keep it a secret" Olivia smirked a little hating that he was as charming as Mark.

Ryan smiled a little "We did have sex a couple of times…her husband was so…rough that you couldn't blame her for cheating on him"

Olivia just nodded "Thank you" She got up from the couch and handed him her card "We'll keep in touch"

"Sure" He took the card and looked at it "Olivia, that's a pretty name"

Olivia looked at him "Thank you. My husband said the same thing" She smirked and left the house.

She sat in her car for a second and just shook her head at what she did. She turned on her car and drove off.

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Later that afternoon Mark came into the SVU precinct looking for Olivia "Hey party poopers"

John and Fin looked up from their desks. "You know you should really get a job Anderson" Fin teased.

"You know what? So should you. Don't you guys have something to do like catch a rapist and not sit on your lazy ass's all day" Mark sat down on Olivia's desk and smirked a t the two detectives.

Casey walked into the precinct and sadly waved at the three men.

"Lose a case or something?" John asked noticing the sadness in the young ADA's eyes.

Casey just shook her head as she went to get coffee.

Mark got up from Olivia's desk and walked over to her "What's wrong?" he asked in a low voice.

"Nothing. Just something at home" She whispered back.

"Let's talk" He put her cup down and took her hand. He led her up the stairs to the roof and closed the door behind him "You can talk to me"

"I don't want to talk to anyone," She answered as she stared out in the city.

Mark hugged her from the back "I'm not anyone, I'm your best buddy"

Casey smirked a little "I called off the engagement last night…Brad told me he didn't want to ever get married and…I just called it off"

Mark turned her around and hugged her "Brad's an ass. If I wasn't married I would be happy to be your rebound guy"

Casey chuckled a little "Olivia is so lucky to have you"

"Yea I know" Mark teased "She's lucky I let her have sex with me as well, cause this body is one of a kind"

She rolled her eyes and shook her head "I want to marry him…I want to have what you and Olivia have. It's not fair"

"Sweetie I don't know if you want what me and Benson have…I should call her that more often…anyway, liv and I have a twisted loving relationship, I cant live without her and she cant live without me…sometimes that a bad thing"

"No it's not, it's very cute and romantic"

"Oh yea? You try having the urge to call your spouse everyday at work or when you're off to come and get them from their work to have lunch, it's pain in the ass I tell you"

Casey chuckled and let go of him "But you have that and I won't since Brad doesn't want to get married…ever"

"You leave Brad up to me, no one makes my Casey sad and gets away with it" Mark winked at her and gave her a kiss on the cheek "Now you don't be sad cause I want your best game face when you have to throw damn rapists in jail ok?"

"Ok. Thanks" Casey gave him a hug and went down the stairs.

Mark followed her after a couple of seconds and now only Elliot was in the squad room and Fin and John were gone "Do you know where your sexy partner is?"

Elliot pointed up the stairs "Crib, she's sleeping"

"Aw my sleeping beauty" Mark smiled and went up the stairs. He came in slowly and quietly closed the door behind him seeing Olivia asleep and with a file open on her chest.

He kneeled down by her and gently took off the file from her chest. Before closing it he quickly noticed the picture and knew it was his parents. He looked confused for a second but decided it was nothing. He closed it and placed it on the floor.

Mark lightly stroked her hair away from her face "Olivia?" He whispered to wake her up.

Olivia groaned "Elliot?"

Mark smiled and rolled his eyes "No, it's Fin"

Olivia's eyes flew open and then spotted Mark next to her "Hey"

"Dreaming of your partner?" He teased as he sat down by her.

"Just a little" She smiled as she took his hand "What are you doing here?"

"Wanted to take you out to lunch if you let me" Mark answered as he lay down by her. "Your hair is very messy"

Olivia smirked and ran her hand through her hair "Where's my file?"

Mark picked the file up from the ground and held it up "This one?"

"Yea" Olivia tried to get it but her moved it away.

"Why are you going through my parents file?"

"The same reason your looking through my mother's file" Olivia answered as she snatched the file from his hands.

"That's different, my case is closed and yours isn't"

"Statute of limitations says it is" Olivia challenged.

"It's different ok?" Mark gave her a kiss on the forehead.

"Sure" Olivia nodded knowing she shouldn't push this if she was going to tell him about his real father.

"Up for lunch?"

"I can't, have some stuff to finish" Olivia answered as she gave him a kiss "Thanks though"

"Sure. Lilly is playing with the twins" Mark smiled and wrapped his arm around her stomach "And I thought I play with these twins" He playfully moved his hand up and cupped her breast gently.

Olivia smirked and rolled her eyes "No" She moved his hand down back to her stomach. "I'm not taking the risk of someone walking in"

Mark pouted and did his adorable puppy face "I didn't get any last night"

Olivia pouted as well and gave him a kiss "Not going to get any in the station house either"

"Mark is so sad" He whispered as he took her hand in his and gave her a kiss on the cheek.

"I think Mark is horny," Olivia whispered with a small giggle.

He chuckled and rested his forehead against hers "That too"

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Casey walked back to the squad room after going to the bathroom and washing her face with cold water in attempt not to cry.

She felt someone grab her arm. She spun around and found herself face to face with Brad. She jerked her arm way from him and continued walking.

"C'mon let me talk to you" Brad pleaded as he followed her.

"Not here" Casey kept walking down the hallway and tried to ignore him since she was still very mad at him.

"Casey don't make me chase you" He caught up to her and stood in front of her so she couldn't keep walking.

"Get out of my way Brad. Go to work"

"I'm off today."

"Then go do something, I have to get back to work" Casey shoved him away and went into the squad room.

Brad rolled his eyes and followed her "Let me take you to lunch then"

"I'm working" Casey answered as she opened a file cabinet.

Brad leaned by the file cabinet "Then just listen if you don't want to talk to me"

"Don't you have other people's hopes to crush?"

"Oh that's cold" Brad shook his head "Real cold"

"Now you know what it's like" Casey gave him a fake smile and went to the coffee pot.

Brad followed once again "Can you give me a chance then?"

"Nope. You had a lot of chances and I'm getting tired of them knowing they wont end in anything good"

"I'll marry you"

"A pity marriage? What all girls dream of"

"No. Look I want to be with you and if marriage is what makes you happy then fine, we'll get married"

Casey looked over at him "You actually think I'm that desperate that I would let you marry me just because you want to make me happy and not because you want to do it?"

"Oh c'mon." He lowered his voice a little "The only reason we hooked up in the first place was because you wanted to get back at that Tommy kid who you were, by the way, having friends with benefits with, Mark's nephew was it?"

Casey gave him a look and walked away.

"Ok that was out of line" Brad followed and smacked himself on the head "C'mon Casey we have a son together think of him"

Casey stopped and turned to look at him and was a couple of inches away from him "You should have thought of him before you said you wanted in on all of this, I'm not going to sit with him at night and explain why his father, that he looks up to, is not around anymore. I cant and I wont look at my son being depressed because his father has commitment issues," She whispered angrily.

"I will still be there for him you know that Casey, I want you back though"

Fin and John walked into the squad room and looked at the couple in the middle of the room. Casey was angry and Brad had a depressed and pleading look on him.

"Hey" John waved slightly seeing something wasn't right.

"Hi" Brad waved back.

Casey rolled her eyes knowing Brad wasn't going to let go of this until they talked or settled this somehow "C'mon" She took him by the arm and led him up the stairs.

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Mark gently kissed Olivia on the temple to bother her.

"Leave me alone, I have to get back to work" Olivia whined and playfully smacked him on the head.

"Hey! That hurts you know?" Mark rubbed his head and moved his hand up to her breast again. "You owe now"

"Your not going to get any so stop trying" Olivia moved his hand back on her waist. "Hey we have to talk about something"

"Was I that rude by touching your breast that we need to a have a talk about it?"

"No, not that"

"Cause if that was rude or disrespectful then I'm sincerely sorry" He gave her a gentle kiss on the cheek and held her closer.

"No it's not that, you weren't rude" Olivia turned to look at him "Promise you wont freak out when I tell you?"

Mark gave her a weird look "Did you sleep with Elliot? Cause I saw that one coming"

Olivia rolled her eyes and shook her head "No"

"Well you should, he is all kinds of sexy" Mark teased as he gave her a kiss.

Olivia smirked a little "I appreciate your sense of humor now and I really hope it will come into play when I actually tell you"

"Tell away sexy detective"

"Ok…well we were doing this investigation-" The door being open cut her off and she immediately stopped talking.

Casey and Brad walked in and Casey closed the door behind her. Neither noticing Olivia nor Mark lying on a bed down the room.

"Look if you want to be immature about this then fine! We don't have to talk about it ever!" Brad yelled at her.

"Fine! It will suit the fact that you don't want to get married!" Casey yelled back.

Mark and Olivia looked at each other and knew it wasn't smart to say anything now while the couple was in a very feisty fight. At the same time they moved down the bed and lay on the floor so Brad nor Casey saw they were in the room.

"You know maybe it's a good thing that you wont marry me! I wont have to deal with your crazy family ever again!"

"You leave my family out of this!" Brad yelled at her "All they ever tried to do was make you feel at home and all you do is bitch about them!"

"Well excuse me but my home isn't in the psycho Italian family!"

Mark started chuckling at that comment. Olivia quickly covered his mouth so they didn't hear him.

"Oh so now it's cause I'm Italian that bothers you?"

"It's your crazy family that bothers me! Your dad, biggest nerd in the world! Your mom needs to relax with the food and oh my god your brother needs to get a life! Your sister needs to wear clothes that at least cover some parts of her body!"

"Well excuse me but not all of us can bang our best friends nephew! Who is ten years younger then them!"

"That was before I met you! You have no right to use that against me Mr. Twenty minutes pre-ejaculation!"

Mark and Olivia quickly covered their mouths trying to keep their laughter to themselves but it was hardly working. Olivia buried her face in Mark's shoulder trying to suppress her giggles.

"That was one time and the first time we had sex!" Brad defended.

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Elliot walked in the squad room and heard some noise from upstairs but everyone was under pressure with this particular case that Mark could have done something stupid again and now Olivia was yelling at him once again. He found them extremely funny since Mark was a huge dork and Olivia couldn't keep from smiling every time she saw him cause he always made her laugh and feel better.

He sat at his desk for a couple of minutes wondering when his partner would come downstairs so he could find out what she found out from seeing Ryan Vaughn, her father in-law.

"Dad?"

Elliot looked up and noticed Dickie standing there. "Hey what's up?"

"Can we talk?"

"Everything alright?" Elliot asked as he got off his chair and put a hand on his shoulder.

"Yea, just need to talk to you about something" Dickie answered.

Elliot nodded and led him down the hall "What's up?"

"It's about Jenny, I know I might sound like a dog saying this but…she's still not…you know…sex…you know what I'm talking about?"

Elliot just nodded being extremely uncomfortable talking about his partner's daughter "I know"

"I respect her choice and everything but do you know why she's so distant when it comes to that subject?"

"She needs to tell you that when she's ready, not me"

"I know but its been a long time ago and everything and she still wont tell me why she doesn't want to have sex yet"

Elliot stopped and looked over at him "Do you realize she's my partners daughter?"

"Yes sir"

"Do you realize I'm extremely uncomfortable talking about that with you considering she's your girlfriend and I knew her since she was five?"

"Yes sir"

"Good. Now you wait until she's ready"

"But dad I have needs too you know?" Dickie gave him a look trying to tell him something without actually telling him.

"What do you want me to do about it?"

"Just tell me why she's distant, I know you know cause Olivia is your partner"

"It's a girl's personal choice"

"Dad this is the 21st century no girl stays a virgin for the old times tradition"

Elliot rolled his eyes "Do you see how uncomfortable I am now?"

"Should I go ask Olivia or Mark about it? That would be smart wouldn't it?"

"Just talk to her, if she doesn't want to tell you then don't push her"

"Fine" Dickie rolled his eyes "I'll be the only guy not getting any this year, what an accomplishment" He threw his hands up in the air and walked away to the elevators.

Elliot smirked and shook his head.

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Mark and Olivia kept lying on the floor and staring at the ceiling still waiting for Casey and Brad to walk out of the room so they could go out. Olivia was rather glad since she was still making conversations in her head how she was going to tell Mark about what she found out.

"Can you stop yelling for a minute!" Brad yelled back at Casey as he started to pace in between the bunk beds.

"Fine" Casey crossed her arms on her chest and just looked at him. "What are you going to do with that tattoo?"

"Nothing. It can be like a family tree"

"Very funny"

"I thought so"

Mark playfully licked the side of Olivia's face since he knew she couldn't yell at him or say anything. Olivia cringed and grabbed him tightly on his privates. Mark's face became redder from the pain and he mouthed a weak 'Sorry'. Olivia smiled and let go.

They heard Casey and Brad leave the room and the door get shut.

Mark pulled himself up a little and looked around the room "All clear"

Olivia sat up and hit him upside the head really hard.

"Hey! What was that for?"

"Don't lick my face, its gross"

Mark rubbed his head and got up from the ground "But you're so cute and sweet that I just want to eat you up" He took her hand and pulled her up.

"Whatever"

"Are you tired?"

"A little. Why?" Olivia asked looking over at him.

He wrapped his arm around her waist "Cause baby you've been running through my mind all day" He teased with a smile.

Olivia rolled her eyes "You need to find a new line"

"How about…is that a mirror in your pants cause I see myself in them"

"No mirror" Olivia teased as she took his hand and led him to the door "I have to talk to you c'mon"

"C'mon I want a mirror in your pants" he whined as she pulled him out of the crib.

"No" Olivia ordered playfully "Think of a good line and then I'll think about it"

"I'm not a good thinker," Mark whined as she led him down the stairs "Where are you taking me?"

"The roof" Olivia answered.

Mark rolled his eyes and let her pull him across the hall to the door of the rooftop. She led him up the stairs. "Do you believe in love at first sight? If not then I'll walk by you again"

"Heard that one too many times" Olivia closed the door behind him.

Mark groaned "You know what? Forget it. I'm going to make you beg for sex from now on"

"Good. Now we need to talk" Olivia took his hand and led him to the ledge and leaned on it.

"Are you going to murder me? Cause sweetie you're in a police station" he whispered playfully as he started to kiss her neck.

Olivia giggled a little and pushed him off gently "Honey I'm serious. This is important"

"Ok. Talk" Mark nodded and sat down by her.

"You're real father is still alive" Olivia blurted out figuring it was easier just to tell him right away.

Mark's smile faded away and he just kept looking at her "That's not funny. You know I don't like to talk about my parents and I don't joke about them"

"I'm not joking, I'm serious. We ran a DNA sample that was found by our victim and it matches a man that has your Y- chromosome. His name is Ryan Vaughn, he lives in Philadelphia"

Mark got up from the ledge and started to pace around "What the hell are you talking about? My parents are dead. Murder-sucide, you know that"

"We guessed your mother had an affair and Marcus Anderson isn't your father"

Mark just looked at her and shook his head "No. He is my father"

"The DNA doesn't match"

Mark covered his mouth with his hand as she closed his eyes and shook his head "I don't believe you" He whispered.

"I'm sorry" Olivia whispered as she got up and tried to hug him but he moved away.

"I'm going to be sick" He gagged and started to throw up in the corner.

Olivia wiped her eyes seeing that he was in such shock and was so freaked out that his body couldn't even handle it physically.

"Oh god" He whispered as he leaned over the ledge "That's why he killed her…It was my fault"

"No" Olivia quickly placed a hand on his back "This isn't your fault"

"Oh god" He placed his hands on the back of his head and closed his eyes "If I wasn't born she would still be alive"

"No. It's not your fault, don't think like that" Olivia placed her hands on the back of his neck "Mark listen to me. I need you not to freak out by this, I can't have you lose it"

"I'm not my father…I'm my mother. She cheated and I cheated. She got pregnant with me by mistake and I got a girl pregnant with Zane. All this time I have been trying not to become that man and I haven't realized I was becoming like my mother"

"It's not the same, I talked to Vaughn and he said that Marcus was abusive and she was just trying to live her life with him"

"You talked to him?" Mark whispered.

"Yea. He seems like an Ok guy, I mean except for the fact that his DNA was found by our victim but it might be a mistake"

"He had an affair with my mother" Mark shook his head "I'm going to kill him" He walked angrily past Olivia toward the door.

Olivia quickly stepped in front of him and leaned her back on the door "You need to keep calm"

"No! How can I keep calm after this! He knew about me and let me go to two foster families!"

"Maybe he didn't know. You didn't know about Zane"

"That was different. I didn't have an affair with Nicole. He did!"

"Sweetheart please calm down ok? For me?" Olivia whispered as she placed her hands on his chest.

"I cant go through this again" He whispered as he buried his face in his hands "It took me forever to get over my parents death and now one of my parents is still alive. It's not fair"

Olivia hugged him and held him "I know. Nothing about this is fair to you"

"How long have you known?"

"I found out yesterday"

"Yesterday?" He asked in a louder voice as he moved away. "How can you not tell me until now"

"Because I knew you would freak out like you are now" Olivia answered "C'mon like there isn't stuff that you should have told me but never did"

Mark quickly thought about the fact that Richard White was his cellmate during his undercover job in Sing Sing and he never told her about it "You're right. It's not a big deal"

Olivia raised an eyebrow recognizing the look in his eyes when he felt guilty since he was a horrible liar and was so honest "What aren't you telling me?"

"Huh?"

"Mark?"

"Yea?"

"What are you keeping a secret?"

"Nothing" He answered with a shake of the head.

"Mark" Olivia warned "Tell me"

"No" He answered casually knowing Olivia would freak out knowing that.

"Tell me"

"It's ok, no big deal"

"Tell me this instance" Olivia ordered.

"You wouldn't want to know"

"Let me decide that"

"No" He shook his head again.

"Mark!" She yelled at him angrily.

He took let out a deep breath and nodded "Richard White was my cellmate when I was undercover in Sing Sing"