Couple of months later…

Casey and Olivia walked in Olivia's house and could hear Jenny and James laughing hysterically.

"Boys no, stop, don't," They heard Mark in the bathroom and Jenny and James by the door laughing hysterically. "Oh c'mon"

"Giving them a bath again?" Olivia asked smiling.

"Yea, my bet is its either shampoo or he is soaked by now" James said smiling.

Olivia smiled and opened the door. Mark had shampoo all over his shirt and had water allover his jeans. The twins giggling in his lap. Mark gave them a kiss and put them down on the floor as he grabbed their diapers from the bag. The twins just laughed and crawled away leaving the towel that was around them behind them and crawled out of the bathroom naked.

"Guys c'mon" Mark said rolling his eyes.

"I'll get them," Casey said smiling as she followed the twins. James and Jenny followed as well.

"Squirted shampoo all over you again?" Olivia asked as she picked up the towel.

"Matthew this time, and Michael splashed the water all over me," Mark said as he took off his shirt.

"Why don't you take a shower and I'll dress them and feed them," Olivia said smiling as she gave him a kiss.

"Want to join me?" Mark asked smiling as he got up and unzipped his jeans.

"I have to dress our sons since they crawled out of here butt naked" Olivia said smiling and gave him a kiss

"Let Casey do it, she needs some love in her life other then Paul. Join your husband in a shower, I haven't spent alone time with you in a months" Mark said as he hugged her.

"I know sweetheart but I have to feed them. Take your shower and we can try and watch a movie together and have a date," Olivia said giving him a kiss. "I promise," She whispered as she let go of him and went out of the bathroom.

Mark closed the door and took off his soaked jeans and got in the shower.

Olivia went to get the twins to dress them.

"Come here guys" Olivia said smiling as she took Matthew in her arms and wrapped the towel around him and then took Michael and wrapped it around him.

"It's so cute how they laugh a lot" Casey said smiling as she kissed them.

"I think they get that from Mark" Olivia said smiling as she walked to their room and placed them on the table.

"Probably" Casey said smiling as she handed her the bag of diapers.

"Mom can I go to Eric's house?" James asked appearing by the door.

"How long?" Olivia asked looking up.

"Couple of hours, I want to show him a new skateboarding trick"

"Be home by 5."

"Ok, bye" James said and went out of the house.

"Mom can I go to Kelly's house?" Jenny asked appearing by the door.

"How long?" Casey asked smirking. Olivia smiled and rolled her eyes.

"Couple of hours" Jenny answered.

"Be home by 5" Casey said smiling as she put a pair of diapers on Michael.

"What she said," Olivia said smiling and rolling her eyes at Casey as she put diapers on Matthew.

"Ok, bye" Jenny said and went out of the house.

"You guys wont leave mommy will you?" Olivia said smiling as she gave the twins a kiss on the head. They just giggled.

"They're so cute" Casey said smiling as she put small overalls on Michael. They're heard the doorbell ring.

"Can you get that for me?" Olivia asked as she put the same looking overalls on Matthew. Casey nodded and went to the door.

"Hi Aaron" Casey said as she saw him.

"Hi Casey, just came to say hi to Olivia and see her twins" Aaron said with a charming smile as he came in the house.

"She's getting them dressed, she'll be right out, you want something to drink?" Casey offered.

"No, I'll just go see her, thanks Casey, good win on the last case by the way" Aaron said smiling.

"Thanks, she's in that room" Casey said smiling and pointed to Olivia and Mark's room. Aaron nodded and went to the room. He knocked.

"Come in" Olivia called out as she picked up Michael and put a bottle in his mouth.

"Hi," Aaron said smiling as he came in.

"Hi, what are you doing here?" Olivia asked smiling.

"Just to say hi and see your babies. Where's your husband?"

"Shower. Thanks for visiting."

"Of course. Which one is which?" Aaron asked looking at the twins dressed in the same overalls and the same t-shirts.

"This is Michael and that's Matthew, but its mostly just Mike and Matt, cause Mark likes the way it sounds" Olivia said smiling as she burped Mike and put him in his crib and then took Matt.

"Don't you get a say in any of that?" Aaron asked smirking.

"Of course but I don't care, it sounds nice when you say it together." Olivia answered smiling as she fed Matt.

"Doesn't your husband help you out, I mean your doing all the work and he's taking a shower in the middle of the day"

"Of course he helps me, don't worry about that, he does feed them when I cant, were a team since these guys are a team against our sleeping" Olivia said smiling as she kissed Matt and burped him and put him down in the crib. Both of the twins fell asleep instantly.

"You know you look very nice after giving birth to twins, not a lot of woman can pull that off" Aaron said smiling.

"Well thank you. Lets go find Casey and let the boys sleep" Olivia said smiling as she headed out of the room, Aaron nodded and followed.

Casey, Olivia and Aaron sat in the kitchen talking about cases and drinking coffee.

"Sweetie have you seen…" Mark started but stopped when he saw Aaron. He realized he was only wearing a towel around his waist. "Hi" Mark said smiling politely and holding the towel on his waist, his muscular chest still wet from his shower.

"Hi" Aaron said smiling politely.

"Mind getting dressed stud?" Casey teased smiling.

"Oh you know you like it" Mark teased smiling.

"You wish. Paul has more muscle then you" Casey said smiling.

"I bet I equal more then him in you know what department" Mark challenged smiling. "How big is Pauly?" Mark teased smiling.

"I'm not telling you, you loser," Casey said smiling. Olivia smiled and rolled her eyes since she knew Mark and Casey liked to argue with each other about dumb things since they saw each other as brother and sister.

"Oh c'mon I'm your best friend" Mark argued.

"No your not, Olivia is" Casey argued.

"And she is my wife which makes her my best friend and since she is your best friend that technically makes me your best friend." Mark said smiling "So in conclusion to my theory how big is your boyfriends equipment?" Mark asked smiling.

"That's slightly inappropriate" Aaron spoke up looking at Mark.

"No its not Sandberg" Mark said smiling politely "This is" Mark said smiling and quickly opened his towel and flashed everyone and closed it.

"Oh my god" Casey said quickly covering her eyes.

"I win this argument Novak" Mark said smiling as he gave her a kiss on the head.

"Mark" Olivia groaned as she put her head in her hands.

"I bet it's bigger then Sandbergs" Mark said and showed a big grin on purpose at Aaron. One of the twins started crying. "I'm on it" Mark said and went to their room.

"He is sort of rude," Aaron said raising an eyebrow.

"You leave my best friend alone Aaron, he is the coolest person in the world" Casey said smiling and sipped her coffee.

"Be right back" Olivia said smiling and got up and followed Mark.

She went in her room and Mark saw was holding Matthew on his arms. His back to the door and didn't see Olivia walk in. Olivia quietly closed the door and just watched him.

"It's ok my baby boy" Mark talked in a baby voice as he tried to settle down Matt. Olivia just smiled finding it extremely cute that he always talked in a baby voice around the twins. "I know your crying cause mommy dressed you the same way as Mike, its ok. I feel your pain buddy" Olivia smiled and rolled her eyes as Matt started settling down. Mark gave him a kiss and put him in his crib.

"Criticizing me again sweetie?" Olivia asked behind him. Mark turned around and smiled.

"Spying on me again sweetie?" Mark asked smiling as he walked over to her and wrapped his arms around her waist and pulled her closer. Still only wearing a towel around his waist.

"You're cute" Olivia whispered smiling as she rubbed her nose against his.

"I'm cute?" Mark asked smiling and playfully pointed to himself.

"Yes very cute, just don't flash my friends next time." Olivia said smiling as she gave him a kiss.

"Why cause Aaron is jealous that I have a bigger penis?" Mark asked smiling. Olivia just smiled and rolled her eyes. "Cause baby this bad boy fathered twins," Mark said smiling and pointed to his crouch.

"Yes it did" Olivia said smiling as she gave him a kiss and on purpose pulled off his towel.

"Oh is that our foreplay now? Don't mind if I do" Mark said and pulled her closer to him and started kissing her. Olivia just started giggling as he started kissing her neck. Mark smiled and looked up at her "You giggle the same way as the boys, how adorable"

"Considering I'm the mom it can't be that surprising" Olivia said smiling and rolling her eyes.

"I love you" Mark whispered.

"I love you too," Olivia whispered

"And you know my penis is bigger then Aaron's and Paul's combined" Mark said smiling.

"I wouldn't know" Olivia said smiling as she gave him a kiss on the cheek.

"Lets ask Casey, she's seen Paul's and mine. I bet she's jealous of you cause you get to…" Olivia's hand hitting him on the shoulder ended his sentence. "Spousal abuse" Mark said smiling and rubbed his shoulder.

"Shut up" Olivia said smiling "Leave Casey alone"

"Can I bother Sandberg?"

"No" Olivia said quickly giving him a warning look.

"No, blah, blah don't bother the jerk in my kitchen" Mark mocked in a funny voice. Olivia just smiled and gave him a kiss.

"Get dressed and meet me in the kitchen, and don't even think about flashing anybody else"

"What else am I going to do?" Mark teased as he gave her a small kiss on the neck and went to his closet.

"Be jealous that Elliot's is bigger then yours" Olivia teased smiling and went out of the room.

"Ha Ha, funny" Mark said smirking as he pulled on boxers and went by the twins and watched them sleep. "Boys never marry a woman who likes to tease you for your size, but don't worry you have Anderson genes so your all set in that department" He whispered as he gave them a kiss on the head and pulled up their blankets.

Olivia came in the room as he was pulling on his jeans.

"Sweetie I have to go, I just got a call" Olivia said as she took her badge from a drawer and clipped it on her belt.

"Better not leave Sandberg here" Mark mumbled as he put on a t-shirt.

"No, Aaron and I are on call today, so he's going with me." Olivia said smiling as she rolled her eyes and walked over to him. "Casey will hang out with you for awhile until she goes on her date with Paul." She said as she wrapped her arms around his neck.

"Ok, fine, I'll baby sit the ADA" Mark said smiling as he gave her a kiss and wrapped his arms around her waist.

"Have fun. I'll try and come for our date tonight"

"Ok. Be careful, I love you"

"Love you too," She said smiling as she gave him a kiss and then kissed the twins and went out of the room. Mark followed her.

"You want to ride with me?" Aaron asked as he got off the chair and was getting ready to go.

"Take my car babe" Mark said handing his keys.

"Its ok were both going to the same crime scene, I'll see you later." Olivia said as she gave him a kiss "You two don't make trouble well I'm gone. Lets go" Olivia said smiling at Mark and Casey and then went out the door. Aaron followed.

"Lets go watch a movie or something till Paul picks you up," Mark said as he put an arm around Casey's shoulder and walked with her to the living room.

"Why don't you like Aaron?" Casey asked as she put a movie on and they sat on the couch.

"I don't mind him" Mark lied hoping he could pass it off.

"Oh please, for a federal agent your such bad liar. C'mon tell me," Casey said as she looked over at him.

"He just hangs too much around liv"

"Mark you don't like anyone who hangs around Olivia" Casey said with a smirk and rolled her eyes.

"Yes I do, I like you, I like Elliot, John, Fin and Don" Mark said rolling his eyes.

"That's because you met us before you married her so you had to like us if you wanted to be with her" Casey pointed out smiling.

"Ok you have a point there. Damn you are a good lawyer" Mark said smirking. "But Aaron is uptight and is always so god damn serious, he just gets on my nerves"

"You two are different that's why. He is serious and you are more of the sense of humor type. He is a nice guy though," Casey said smirking

"Yea, yea, whatever" Mark mumbled as they went back to watching the TV. After a while Mark spoke up again "How can you stand him, every time someone makes a joke he finds something bad about it"

Casey just rolled her eyes "Cause he is responsible and is a serious guy and your just crazy and obnoxious"

"I am not," Mark said defensively looking at her "I have 4 kids and a wife, I am responsible."

"That way you are I know that. But when it comes to jokes your obnoxious and he is not" Casey said smiling. They heard the doorbell. "Its probably Paul, I'll get it" Casey said as she got up from the couch.

"No way!" Mark said jumping up and ran in front of her to the door. Casey just laughed and finally got to the door.

Mark opened the door and a man who looked Casey's age and was extremely attractive standing there dressed in jeans and a nice dress shirt.

"Hello Mr. Griffin" Mark said crossing his arms on his chest. Even though he knew Paul before Casey met him he still always treated him the way he treated every boyfriend she had.

"Oh god here we go" Paul mumbled smiling.

"Excuse us Mark" Casey said smiling and pushed Mark out of the doorway.

"You are not going out like that in that skimpy outfit" Mark said looking at Casey. She smiled and rolled her eyes since she was wearing jeans and a sweater.

"Bye Mark, say hi to Olivia for me" Paul said smiling as he took Casey's hand. Mark quickly took his hand and hers and separated them.

"What are your intentions with Casey?" Mark asked looking at Paul with his arms crossed on his chest again.

"You ask me this every time I see you," Paul said rolling his eyes.

"Good night Mark" Casey said giving him a look as she took Paul's hand again.

"Say hi to your mom for me and if I hear your not treating Casey well your mother will hear from me and I know you don't want Isabel up your ass" Mark warned smirking.

"You got it, bye" Paul said as he led Casey down the steps.

"I want her home by 10" Mark called out smiling. Paul and Casey just laughed as they got in the car. Mark smiled and went back in the house and checked on the twins.

It was already 9 at night and almost everyone from the SVU squad was gone.

"I'm calling this a night, see you tomorrow" Elliot said as he went out of the squad room. It was only Olivia and Aaron left in the room.

"I'm going to get going as well," Olivia said as she took her jacket.

"How about a drink and then I can take you him?" Aaron offered as he got off his chair.

"No its ok, I should get going, I have a date with Mark" Olivia said smiling.

"Aren't you two married?" Aaron asked as he opened his locker.

"Yea, but he likes to have small dates, he says it keeps him charming to have to flirt with me like we are on a date" Olivia said smiling as she put her gun in her locker.

"I don't want to sound mean or anything but he's kind of obnoxious and I worked with you for a almost a year and you seem like you like serious guys" Aaron said as he opened the door to the squad room for her.

"He isn't obnoxious he just likes to have fun, he is serious when he needs to be, he is in the FBI after all"

"If you say so. Have one drink with me, my treat and I'll drive you home" Aaron offered again as they walked down the hall.

Olivia looked at her watch. Nine. "Fine, one drink and I have to go" Olivia said smirking.

"Deal" Aaron said smiling his charming smile.

They sat at the bar drinking their beer.

"Your very beautiful for a detective" Aaron said smiling as they sat across each other.

"Well thanks" Olivia said with a small smile finding it weird that someone told her this since it was usually Mark telling her how sexy she is.

"How about one shot?" Aaron asked.

"No, I should get going, I'm finished with my beer." Olivia said as she finished the little bit left in her bottle.

"One shot, how many times have you taken shots?"

"One shot and that's it"

"Ok" Aaron said smiling as he got up and got two shot glasses filled with alcohol and sat down directly next to her.

"Cheers" Olivia said smiling and she did her shot. "Damn that's strong" She said as she wiped her mouth. Aaron smiled and did his shot.

They did a couple of more shots. Olivia was already tipsy since shots ran threw her quickly. Aaron hardly felt anything since shots hardly did anything toward him.

"You're extremely beautiful Olivia" Aaron whispered getting close to her face. Olivia had enough alcohol in her that he sounded the same as Mark since they both had deep voices. Olivia leaned in further and kissed him. Aaron started kissing her back.

Olivia quickly realized it wasn't Mark's gentle lips and she quickly pulled away.

"Oh my god, I cant do this" Olivia said quickly getting up.

"No one has to know" Aaron said taking her hand. Olivia quickly pulled it away.

"Oh my god, gross, I'm married Aaron" She said disgusted and grabbed her jacket and went out of the bar quickly.

She looked at the night sky and felt like kicking herself for not taking Mark's car when he offered. She didn't want to call him and tell him why she couldn't let Aaron drive her home. She didn't want to call Elliot cause she knew he would ask questions. She took out her cell phone and noticed the time. 12

"Our date" she mumbled to herself realizing she missed their date. There was no way she could call Mark now.

She hailed a cab and went straight home.

She quietly unlocked her door and noticed most of the lights were off which meant everyone was sleeping. She checked Jenny's and James's room and they were sleeping. She checked on the twins and they were in their small pajamas sleeping. She smiled when she noticed that Mark put different color pajamas on them since he always said that they should be unique twins.

She noticed the light of the TV reflecting the walls of the living room. She went in and saw Mark sleeping on the couch with his jeans on. Waiting for her like he always did.

There was popcorn and M&M's in bowls on the table and DVD cases scattered around the table. She ran her hand through her hair realizing he set it up for their date that she never showed up for.

She gently went to his side and stroked his hair to wake him up.

"Hey your home" He whispered with sleepy eyes.

"Yea, I'm sorry I missed our date," She whispered placing her hand on his cheek.

"Its ok. How was work?"

"Um…fine" She said with a small smirk hating to lie to him. He took the back of her neck and pulled her down for a kiss. These lips were gentle and the right lips.

As she kissed him only one thing ran through her mind How the hell do I tell my husband I kissed another man when I was supposed to have a date with him.

A/N: Suspense? Haha I hope so! Please leave reviews! Anybody else wish Mark was there for her in 'fault' haha j/k but that was awesome episode!