Disclaimer: I don't own anything.

Thanks for all the reviews! Sorry for the major delay in updating. It will be Addek in the end. I promise. Just keep reading.

Addison and Mark were sitting in the bar getting a drink after dinner.

"We're old." Addison laughed.

"Why do you say that?"

"All we could talk about all night was the kids. It's not bad. We both love them. It's just boring. We used to be more fun."

"Well, as you already pointed out we're old. By the time we're done with a long shift at work and putting the kids to bed, we're too tired for fun. I don't have the energy for that anymore."

"It is nice to get out though. I did need a break even if we talked about them all night."

"You deserve a break. You worked hard at home all week."

"What if we go home now and put our feet up and relax?"

"Wow. Who are you and what happened to Mark?"

"I mean our date doesn't need to be over, we could just move it somewhere a little more comfortable." He winked at her.

"Oh there he is." They both laughed and walked to the car. When they got home, Mark went to put the key in the door but stopped.

"I had a really good time tonight."

"Me too." Mark leaned in to kiss Addison. She didn't stop him. Mid-kiss the front door opened. Derek and Kaitlyn were standing there. Kaitlyn was giggling.

"So I guess your date went well?"

"It did." They went inside.

"What are you doing up?"

"It's 10:30 on a Friday night."

"Oh that's true."

"You're just getting old. Getting home early and all."

"I hope your sister is asleep."

"She is. Just like you left her."

"Good." Derek started gathering his things.

"Well, if I'm not needed, I'm going to head over to Meredith's. Unlike you old folks, I still know how to have fun on a Friday night."

"Shut up. You're older than me."

"Thanks for babysitting."

"Anytime." Derek left. Mark turned to look at Kaitlyn.

"So young lady. I think it's time for bed."

"It's Friday." He leaned in and whispered to her.

"If you go to bed now, I'll take you to the mall tomorrow."

"Okay. I was going to sleep anyway. I just wanted to know why you wanted me too." She went upstairs.

"She played me." Addison smiled.

"Yup." He walked over to her and put his arms around her.

"Now where did we leave off."

Few weeks later. … Mark was making breakfast for the girls while they sat at the counter and watched.

"Daddy, why do you get to have so many sleepovers on school nights with Aunt Addie?" Kaitlyn laughed.

"Yes dad, why do you get to have so many sleepovers?"

"When two grown ups love each other a lot, they get to have sleepovers all the time."

"Oh."

"I was thinking maybe Aunt Addie should live with us, but I wanted to know what you girls thought."

"You mean she would be here all the time?"

"Yes."

"Yay!"

"Kaitlyn, what do you think?"

"I think it's good. I like it better when she's with us." He smiled. He was glad Lily and Kaitlyn were so happy.

"Me too."

"When will she move in?"

"I don't know. I have to find the perfect moment to ask her."

A few nights later Mark decided to have one night just him and the girls before asking Addison to move in. It was practically the only night she hadn't slept over in a while. In the middle of the night, Lily woke up screaming. Mark held her while he quickly called Addison, who sleepily answered the phone.

"Hello?"

"Addie, I need help."

"It's 3 am Mark."

"I know. Lily's burning up and I don't know what to do."

"You're a doctor."

"I know. She's really hot. She's crying. She's been coughing some. And she won't tell me anything."

"Okay, okay. What's her temperature?"

"I don't know."

"Well, take it."

"I don't have anything to take it with."

"Alright. Do you have children's Tylenol?"

"Were you giving it to Kaitlyn?"

"Not stuff Lily can take."

"Then no."

"Alright. I'm coming. I'll stop at the drugstore on the way if I can find a 24 hour one."

"Thank you."

Mark was walking around the living room with a crying Lily when Addison came in.

"Hey, hey. Aunt Addie's here." Addison put the bags down and walked over to Mark and Lily.

"Hi Cutie. Are you going to tell us what doesn't feel good?" She put her arms out for Addison. Addison took her. She rested her cheek against Lily's forehead. "She is really hot."

"I know."

"There's a thermometer in one of those bags." He found it and opened it. Addison sat on the couch still holding Lily. Mark brought the thermometer over and put it in Lily's ear. She moved as he did it.

"You have to stay still honey." He did it again. "105.2" Addison was surprised.

"Are you sure?"

"That's what it says."

"Do it again." He did.

"Same."

"Let me see it." She laid Lily on the couch and took her temperature again. "105.2. What are we going to do?"

"That's why I called you. You know what to do."

"That's a very high temperature."

"I know."

"Should we take her to the hospital?"

"We're both doctors."

"I know, but what if something happens that we can't take care of here."

"When would a normal parent take their kid in?"

"I don't know." She stood up. "I'll be right back."

"Where are you going?"

"To look online." She came back a few minutes later. "We're taking her in. Or I will and you can stay with Kaitlyn."

"What should we do?"

"She's going to the hospital."

"I know. I mean about Kaitlyn."

"It's after 4 now. Someone's going to have to come back and get her up for school if both of us go."

"Are you going to worry yourself sick if you don't go with her?"

"This is scary Mark."

"Alright. Do you feel comfortable taking her alone?"

"I work there everyday."

"I don't feel comfortable leaving Kaitlyn alone while she's sleeping and doesn't know what's going on."

"Okay. I'll take her. Can you get a blanket?" She picked up Lily and Lily laid her head on Addison's shoulder. Mark came back with a blanket. She wrapped it around Lily. "Keys?"

"You want my car?"

"We don't have time to switch the carseat." They traded keys. "I'll call you when we know something."

Addison carried Lily into the ER. Izzie was down there.

"What are you doing here Lily?"

"Lily is really sick."

"Do you need help?"

"Page Arizona."

"Okay."

"What's open?"

"There's only one other person in that room."

"Okay." She walked into the room Izzie pointed to. Derek was in there talking to a patient. He almost bumped into Addison as he was leaving the room.

"Hey."

"Hi."

"Are both you and Mark working?"

"Neither of us. Hold her for a minute." Derek put the chart down and took Lily.

"She feels warm."

"I'm well aware." She pulled a thermometer out of the cupboard. "At home the thermometer said 105.2."

"That's high."

"Sit on the bed with her." He did. "Lily. Cutie. Look at me. I need you to calm down for a minute. Open your mouth." She did. Addison put the thermometer under her tongue. "Close your mouth and don't open." A few seconds later it beeped.

"Well?"

"105.1"

"What are you going to do?"

"Stevens is getting Arizona."

"What's wrong with her?"

"We have no idea, which is part of why she's here. Lily, can you tell me what doesn't feel good now?"

"My head." Addison felt her forehead.

"I know. You have a very high fever. Anything else honey?" Lily coughed.

"I don't know."

"We'll make you better." Addison kissed Lily's forehead and a tear fell down Addison's cheek. She felt bad that she couldn't instantly fix her. Derek put his arm around Addison.

"She's going to be okay."

By afternoon Lily's temperature had dropped and Addison took her home. She carried Lily into the house and put her down when they got inside. They were both very tired.

"Noo." Lily started to cry. "Nooo." Addison put some things down and took off her coat.

"Wait a minute cutie pie. I need to put this stuff down." She picked Lily up again and Lily laid her head on Addison's shoulder. Addison gently rubbed her back and walked into the living room. Mark came up from downstairs.

"Hey. How's she doing?"

"A lot better. Her temperature came down a lot. We have antibiotics for her to take. We're really tired right now." He came closer and rubbed Lily's back.

"Thanks. Really. I don't know what I would have done without you."

"You're welcome. And I don't know what I would have done if I wasn't with her. I care about her like she's my own."

"I know but still you didn't have to."

"Will you take her for a minute?"

"Yup." He took Lily out of Addison's arms.

"Addd…"

"You're okay. Daddy's holding you. I need a drink and a snack and then I'll take a nap with you." Addison went into the kitchen and she came back a few minutes later. Mark was rocking Lily and Lily was crying. She sat on the couch. "Alright come here." Mark put Lily in Addison's lap. Lily laid her head against Addison's chest.

"I don't want you to leave."

"Don't worry cutie. I'm not going anywhere." Lily closed her eyes. Mark decided it was the perfect opportunity to ask his question.

"I don't want you to go anywhere either."

"I just said I'm not."

"I mean ever. I want you to be with us always. Move in with us."

"That's a big step."

"I know. You're here all the time anyway. Most of your stuff is here. The girls love you. I love you. We want you here. Things are good. I want to keep them that way. I want you to be with us."

"Sure why not. I love you and the girls too."