Thanks for the reviews everyone

Thanks for the reviews everyone! Glad everyone is enjoying the story so far!

"You what?" said Meredith shaking her head at his words. "Derek you didn't even ask me about it, if it would be okay with me.

"I know I didn't, but it was so last minute and they're really good girls. They really shouldn't give us too much trouble." said Derek as he got up and stood in front of Meredith looking her in the eyes. "Please Mere…" said Derek as he gave her his signature smile and twinkled eye look.

Meredith tapped her foot debating, with her arms crossed over her chest. She finally let out a long sigh. "Fine. They can come." said Meredith as she regretted saying those words. "But your going to have to handle this, I don't know anything about infants and toddlers, besides medically. And your going to have to ask the chief for the time off." said Meredith as Derek kissed her as a thank you.

"Already done. Our schedules have both been covered for." said Derek. "Alex and Izzie are crashing at George and Lexie's place so the girls can have their rooms.

"Wait how did you do all this not knowing if I'd say yes or not?" said Derek as she raised an eyebrow at him.

"Well I figured if you were really mad, I'd spend the next four days apologizing and making it up to you." said Derek with a sexy smile.

"Well you could make it up to me now." said Meredith as she led him to the bathroom. "By taking a bubble bath with me." said Meredith with a sly smile.

"It would be my pleasure."

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Meredith paced the living room hallway as she looked at her watch for the billionth time in the last two minutes.

"Mere you're going to wear a whole in the ground." joked Derek as he walked up and put his arm around her waist. "It's going to be fine; Kathleen can't stay long to talk anyway, so she'll drop off the girls and leave.

Meredith let out a nervous breath as they herd a knock on the front door. She went and opened to reveal a woman with light brown wavy hair and deep brown eyes. She carried a baby carrier and held onto a little girl's hand.

"Uncle Derek!" screamed the little girl as she rushed inside to the arms of Derek.

"Ava!" said Derek trying to match his niece's level of enthusiasm, as he scooped her into his arms.

Kathleen stepped into the house smiling at her brother interacting with her daughter. "You must be Meredith, I'm Kathleen nice to meet you and thanks for agreeing to do this." said Kathleen as she kissed Derek on the cheek. "I hate to meet and run, but Tim's in the car and we've got to be in California before dark." said Kathleen. "So with that being said…." said Kathleen as she handed the carrier to Meredith.

"Oh…" said Meredith as she took the carrier.

"Here's their bags." said Kathleen as she stepped outside and dragged two duffel bags and a diaper bag in. "And here's the stroller." said Kathleen as she dragged that in and collapsed it so it was flat.

Meredith's eyes lit up in nervousness. "Is that everything?"

Kathleen smiled and placed a hand on Meredith's shoulder. "I know it's a lot to take in at once, but you'll be fine. Alright I've got to go, I'll call tomorrow. Bye girls." said Kathleen as she quickly left waving as she shut the door.

Meredith sighed as she put down the carrier on the floor as Leah face squirmed up and she started to wail. Meredith looked to Derek in panic as he looked over from where he was bouncing Ava.

"Pick her up." said Derek as he bounced Ava on his knees while sitting on the couch.

"I... I don't how to." said Meredith nervously.

"Just support her head." said Derek as he looked at Meredith reassuring her that she could handle this.

Meredith nodded as she reached into carrier undoing the buckles and pulled the screaming infant out. She immediately put her up against her chest and bounced her to soothe her. "Shh. It's okay Leah. Are you hungry is that what's wrong?" said Meredith as she talked to the baby and held with ease like she'd been doing it for years.

Derek smiled as she eventually got Leah to settle into her arms. She then sat down with her on the floor handing her one of the toys from the toy bag Ava had dumped.

"Uncle Derek Mommy said I meet Aunt Meredith." said Ava as she played with a doll.

"She's right. That's Aunt Meredith right there." said Derek pointing to Meredith.

Ava immediately stood up from what she was doing and walked over to Meredith. She smiled as she handed her the doll she had in her hands. "Play dollies?" asked Ava.

Meredith smiled at the little girl. "Sure. Let me just give Leah to Uncle Derek okay?" said Meredith as she stood up and handed Derek Leah and resumed her spot on the ground.

Ava handed her the doll back again. "Kiss her." instructed Ava.

Meredith eyed Derek before kissing the top of the toy's head.

"Now burp her." said Ava.

Meredith worriedly looked at Derek. "Umm… Ava I've never burped a baby before so I'm not sure how. "said Meredith as she looked at Derek almost ashamed.

Ava looked at her quizzically and took the baby doll from Meredith's arms and demonstrated. "Like this." said Ava as she held the doll against her chest and patted her back.

"Did Mommy show you that Ava?" asked Derek as he handed Leah to Meredith as he kneeled down on the floor with his niece.

"Uncle Derek burp dolly." said Ava handing him the doll.

"Alright." said Derek as he pretended to burp the doll. "Ava, I used to do this to you when you were a baby." said Derek as he smiled at Ava.

"But now I'm a big girl." said Ava.

Thoughts rushed through Meredith's head. He was going to be the perfect dad, what was he doing with someone like her? She didn't know how to do anything with kids. She didn't know how to change a diaper, or how or what to feed or bath them. He was the perfect guy, and he was going to be the perfect father and she was a complete disaster with anything kid related.

"I… can't…. "said Meredith handing Derek Leah and rushing out of the room and into one of the back rooms.

"Meredith." called Derek after her, no knowing what caused her to leave. "Ava come upstairs with me, I'll show you the room you'll stay in." said Derek reaching for the little girl's handing as he held Leah in his arms. He quickly climbed the stairs. He showed Ava the room and made her stay there and took Leah with him into his and Meredith's bedroom. He walked into to find her standing by the window watching the rain come down.

"Mere?" he called out to her as he stood at the doorway, with the infant in his arms.

She turned around to see him standing there and turned back around silently.

"Meredith." said Derek walked over to her. "What just happened?" asked Derek.

"What just happened? What just happened is you're the perfect guy, you're going to be the perfect dad and I'm her!" Meredith angrily shouted, causing Leah to start crying. "See?" said Meredith.

"Mere." said Derek as he bounced the baby slightly to get her to quiet. "Meredith look at me." said Derek as he pulled her face gently to look at him. "You are not her; you're never going to be like your mother. Did you see how you handled Leah crying? The way you soothed her, Meredith your going to be a great mother, I just know it. You don't know everything but neither do I" said Derek as he tucked a piece of her blonde waves behind her ears. "But when the time comes, when we do have kids, I have no doubts you will be a great mother. Okay?" said Derek as he smiled softly at her.

Meredith nodded with a faint smile. "Okay."

"Alright then, let's go feed these monsters." said Derek as he tickled Leah's belly causing her to giggle.

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Meredith rolled over as the thunder boomed outside. She laid her head against the pillow and pulled the comforter closer to her. She closed her eyes and stayed like that for five minutes before she heard another crack of thunder and crying. She sat up and shoved Derek.

"Derek… Derek wake up." said Meredith as she shoved him gently. "One of the girls is crying." said Meredith as he turned over and mumbled something incoherent. "Derek!" Meredith whispered loudly. She sighed and gave up when she realized he wasn't budging. She quickly got out of bed walking down the hall to Alex's room, where she heard Ava crying. She then cracked open the door.

"Ava?" she called as she walked over to the bed and saw an upset Ava, sitting up in the bed surrounded by pillows. "Did the storm scare you?" said Meredith as she walked closer to the frightened child. "Do you want me to go get Uncle Derek?" asked Meredith

Ava shook her head no furiously as she devoured into loud scared sobs. "I want you!" cried Ava reaching out her little arms to Meredith.

Meredith almost froze. This little girl wanted her, a woman she had known for a couple of hours. She immediately picked her up and rubbed her back. "Alright, it's okay. I know that storms can be scary, but the storm can't hurt us in here." said Meredith as she gently pressed a kiss to the little girl's sweaty forehead. "Do you want to come and sleep with Uncle Derek and I?" asked Meredith.

Ava nodded as she slowly quieted down and laid her head on Meredith's shoulder as she carried her across the hall. She placed her onto the bed and the climbed in with her. Ava snuggled close to her as Meredith gently rubbed her back. About ten minutes later, Meredith heard her sleeping and shut her own eyes. Derek rolled over a few minutes later to see Meredith with her arm protectively around Ava and smiled. He then kissed both of their foreheads as Meredith's eyes fluttered opened and she smiled sleepily.

"See? Nothing like her."

Hope everyone liked the chapter! Reviews make my day, so hit the purple button. Also I'm thinking I will be writing one to two more chapters with Derek and Meredith watching the girls. Got to love the fluff!