Rajesh, Lenard, Howard, and Sheldon all sat in the apartment, while Penny, Bernadette, and Amy were getting ready in Penny's apartment. It was a normal Tuesday, despite the fact that Penny had been given the night off, and they were preparing to leave at the Sheldon approved time, to go to the Cheesecake factory for dinner. Howard had informed them that their group of seven would be a group of nine tonight, an arrangement Sheldon agreed to three weeks ago.

"Who are the other two people Howard?"Leonard was sitting in his usual chair flipping through a comic book.

"It's someone you guys have never met. You know how Penny was talking about having a new neighbor upstairs?"Howard looked for everyone's approving nod. "Well I happen to know her. I don't know how to tell you this, but she's my sister." The other three jumped and stared at Howard.

"You've never mentioned a sister before."Sheldon stared at him incredulously.

"Well I see her all the time, but she's normally too busy to visit, so me and Bernie go to her house. Her and Kai needed a place to move, and the apartment above Penny just happened to be open, so she moved in." Howard shrugged as the others sat back and began imagining a Howard look alike.

Penny and Amy were sitting on Penny's couch talking, while Bernadette fixed her hair in the bathroom, when someone knocked on the door. Penny opened the door and stared in curiosity as she looked at the woman on the other side. The woman in front of her was maybe a few inches taller than Bernadette. She had a round face, with evident laugh lines. Her eyes were round, and a bright blue. Her hair hung in loose curls, and was a mixture of brown and blonde.

"Um can I help you?"Penny looked at her clothes, and smiled a little. The woman in front of her was wearing bright red skinny jeans, with a red and black plaid shirt, that was tied in a knot, showing off part of her toned stomach, and her Iron Man belt buckle. On her feet she wore solid black converse.

"I think I have the wrong apartment. Is Howard here?"The other woman's voice was quite, with an almost melodic under tone.

"Howard? As in Howard Wolowitz? About this tall and creepy? Jewish Howard?"Penny held up her hand as the other woman laughed.

"Yes that would be him."

"He's across the hall?"Penny answered with a slight question before the other woman thanked her and knocked on the other opened the door and smiled at the woman.

"Mickey."Howard sighed before hugging the other woman tight. Penny ran into her apartment to get Bernadette, screaming about another woman.

Bernadette walked out of Penny's apartment, followed by Amy and Penny. When she opened the door to the apartment she let out a happy squeal, and hugged the other woman. Penny stood there confused as Howard walked over to her.

"Guys, this is my sister McKayla."Everyone looked back and forth at the two as they smiled at each other.

"I can see the fashion sense Howard, but no offense, but she's um."Penny stumbled trying to find the words.

"Yes my sister is attractive Penny."Howard smiled as McKayla let out a laugh.

"Okay, well I know we are leaving in ten minutes, Josel should be bringing Kai by any minute now. I've been moving in all day so I had her take him to the park."Suddenly McKayla's phone went off and she glanced at the message. "there he is. I'm going to go run and grab his bag and then go get him from downstairs, he's missed his Uncle Howie and Aunt Bernie."McKayla smiled before leaving the the door shut all eyes turned to Howard.

"So here's the thing, Kai is McKayla's son. He is four years old, and no one talk about it. Kai's father was murdered before Kai was even born, so McKayla is all he has ever known."Howard grabbed Bernadette's hand and sighed.

After a few minutes the door opened again and McKayla walked in carrying a little boy. The boy had his face hidden in her hair shyly. After a moment McKayla whispered in his ear and his perked up. His dark brown hair almost covered his dark blue eyes. He looked identically to McKayla in face structure. A severe frown was on his face, until he noticed a word the child got down and walked over to Howard, who picked up the small child.

"Sorry, he's mad because Josel wouldn't let him have ice cream for lunch."McKayla smiled as Kai sighed. "Well I do believe it is time to head out." McKayla glanced at her watch. "Sorry, being punctual is second habit. Kai is a little OCD about his daily schedule."McKayla laughed before grabbing Kai and following the group out of the apartment.

The group sat down at a large table, much to Sheldon's disappointment When they were all seated McKayla quickly began looking over the menu and whispering to Kai about his food selection. When they were finished she puled out a case of super hero toys from her bag and set them in front of him.

"So McKayla, what do you do?"Leonard smiled at the young woman.

"I actually just got a job at Cal Tech working in the Physic's department."McKayla smiled. "I'm more of an assistant to Siebert."Howard coughed slightly and McKayla glared at him.

"McKayla recently obtained her Ph.D in Theoretical Physics but she prefers to use her Master's in Art instead."Howard yelped as McKayla stomped his foot under the table.

"Theoretical Physics?"Penny gaped at the other woman as she nodded.

"Yes, I have had a mind for physics ever since I was young, but art is my passion. I am the coordinator for the physics department, which basically means I over see all the experiments and hypothesis now."McKayla smiled sweetly before Kai pulled on her shirt to whisper in her ear. "Excuse me."She smiled before grabbing Kai's hand and leading him to the bathroom.

"How can someone that pretty be that smart?"Penny shook her head as she Watched Raj check her out, to which Howard quickly hit him.

"Just because she is a pyhsicist doesn't mean she's pretty doesn't mean she has to be stupid."Howard sighed as he thought about McKayla working at Cal Tech.

"Hey Amy, Penny, we are going out Thursday for ladies' night right? Why don't we invite McKayla? She doesn't have too many friends, and she's always working or taking care of Kai, maybe it will be good for her to get out sometime."Bernadette smiled as they a moment McKayla and Kai returned to the group, and the waitress quickly took everyone's orders.

"So you're on artist as well?"Leonard smiled at McKayla when she nodded.

"Yes, art is my passion."She smiled at him happily as he nodded. "Maybe sometime you could come up to my apartment to see it, if you're interested."She offered, causing Penny to almost choke on her drink, and Leonard to happily agree.

Once dinner was over, McKayla carried Kai from the interested, since he had quickly fallen asleep.

"It was wonderful meeting all of you. I'm always upstairs if you need anything, but i'll see most of you tomorrow at work."She laughed slightly as she slid Kai into his car seat, which Sheldon noticed was covered in Star Wars pictures.

Sheldon could not help but to be intrigued by the new comer. He normally did not find women attractive, or fawn over them the way most men did, but with McKayla there was something different about her. Sheldon quickly shook the thought from his mind as he told her good bye, and got in the car with Leonard. Leonard has promised to take Sheldon back to his office so he could pick up some papers before returning home.

When they walked into the apartment Leonard and Sheldon stopped in their tracks. McKayla had obviously gotten home early and changed, she was standing before them in a pair of cut off shorts, with very detailed drawings of the Marvel grouping of heroes and villains going across them. Her plaid top was replaced with a mesh hoodie that was very see through, revealing a neon green sports bra and on her feet were flip flops. McKayla had just finished speaking to the apartment manager, and turned around, carrying a basket of clothes.

"Oh hi guys."McKayla smiled as the two men nodded at her, before walking up the stairs, the other two following her.

"So do you have your own office?"Leonard attempted making small talk, beofre glancing over at Sheldon, and almost stopped when he noticed Sheldon actually looking at McKayla.

"Yes, it's next to Siebert's, it's small, but it will work."McKayla grabbed what appeared to be a walkie talkie from her laundry bag and listened to it, before seeming satisfied and putting it back down. "Kai is asleep, I hate leaving him alone, so I bought a baby monitor He hates this thing, but it helps me feel safe."She laughed as they stopped on the boy's floor.

Penny opened her door and looked at the sight before her. She couldn't help but to be a little annoyed at the newcomer, but quickly shook it off, before walking downstairs to leave. MacKayla quickly bid them farewell before walking to her apartment to retire for the night.