This is my first Chicago Fire crossover. A few things I want to say before I start, Antonio doesn't have kids or an ex wife. Shay is still alive so no Brett at 51 but she is still around at another house. Mollys is owned by Herrmann Otis and Cruz. Sofia is 10 Gabby is 30 Tonio is 32.

"Tonio, I'm going to work see you after shift." Called Gabby into the house the small family were renting as she left.

"We'll be fine Gabby, go enjoy your first shift." Antonio Dawson called back. It had been a few weeks since they had moved from New York for a fresh start. Sofia started school in a week, he worked at the 21st district in Intelligence and it was Gabby first day as the PIC at 51. They were waiting awhile before telling anyone at work about their sister as Gabby wanted to get settled first and they didn't want the news going from Antonios team to the firehouse. "Hey Sof" Antonio heard footsteps coming round the corner.

"Hey Toni where's Gabby?" Said the ten year old.

"It's her first day at the firehouse remember"

"Oh yeah" the girl sat next to her big brother. "What's for breakfast?"

At the firehouse

"Hey guys do you know where Leslie Shay is?" Gabby approached the wooden table in the main room of the firehouse.

"Another girlfriend?" Asked a bald guy.

"Shay never mentioned you?" Said the person who looked to be in charge.

"No I'm the new PIC here" said Gabby surprised. The group exchanged a glance before the leader got up.

"I'm Kelly Severide, lieutenant on Squad 3" Severide went round the table introducing everyone.

"I'm Gabby Dawson" Gabby introduced herself.

"Hey Shay!" Severide shouted to a blonde who was just coming out of some doors. "The new PIC is here" the woman jogged over.

"Let me give you the tour and you can meet everyone else." She linked Gabbys arm through hers and headed into the building. Once the tour was almost over Shay led her into the bunk room. "Hey Casey, this is Dawson the new PIC." Casey turned round and spoke.

"I'm lieutenant on Truck, I guess Shay has introduced you to everyone?" Gabby nodded. "I'll let you continue the grand tour." Shay pulled Gabby away.

"This is the locker room and this is your locker." Shay showed her a locker. "I'll let you put your stuff away, I'll be watching TV if ya need me" Gabby turned to the locker and saw what everyone had on theirs so she picked up the tape and stuck a piece to the front and wrote her name before pulling out her phone and sending a picture to Tonio. Everyone seems nice gonna talk to chief in a bit about our situation. How's the kiddo? Tell her I'm sorry for not seeing her this morning xx. She pressed send. Ambulance 61 man down due to unknown causes... Gabby put her phone in her pocket and headed for the ambo.

"Ready for our first call?" Asked Shay.

"I was born ready." Gabby said making Shay half laugh half smile.

"Hey Fia, Gabby says sorry for not seeing you before she left." Said Antonio across the breakfast table.

"Tell her it's ok and I miss her already." Antonio started typing Fia says it's ok, we miss you xx

"That good?" He showed his little sister the phone she lent forward and pressed send.

Shay and Gabby got back from there call and went to grab some food. "How was the first call ladies?" Asked Boden when he saw them enter the firehouse.

"All good Cheif" replied Shay. The pair carried on walking then Gabby turned to her new partner.

"Be back in a minute." She turned on her heel and walked to the chiefs office. She knocked on the door "Hey Cheif can I talk to you?"

"Of course come in." Gabby stepped in and shut the door behind her. "What can I do for you?"

"What are the policies for bringing kids to work with you?" She asked worried about the answer.

"Your file didn't say you had any kids." Said Boden confused.

"She not my daughter she's my little sister but I'm her legal guardian."

"This house is one big family, so as long as she doesn't get in the way she is welcome."

"Thanks Cheif." She turned the door handle as her phone started going off. She picked it up, looked at the caller id before stepping out of the office and out behind the house. "Hey Tonio what's up?"

"How did it go with the Chief?"

"Good I just got out, is everything ok?"

"I have to go into work now and I can't take Sofia with me."

"Okay, get her to pack some stuff, overnight clothes, toothbrush and some stuff to keep her entertained and I will be there in a minute." Gabby hung up and re-entered the fire house. "Hey Shay I need to run an errand." She said to her partner who was not doing anything.

"Where we going?" Shay asked as the ambo pulled out of the firehouse.

"My place" Shay looked at her confused. "Me and my brother are our little sisters guardians and he is being called into work so she is coming to the firehouse."

"Cool, have you told Boden?" Asked Shay.

"He knows I will need to bring her to the house sometimes on shift but he doesn't know it's today." She pulled up. Out side a small townhouse with two people stood out side. Shay guessed the girl was ten and he was older than Gabby but not by much. "This is it" Gabby hopped out, she turned around and whispered to Shay, "Don't bring up parents" she got out and started talking to her brother. "Hey Tonio, this is my partner Shay."

"Hi Shay I'm Antonio I'm in the intelligence unit but I have to run." He turned to the girl. "Be good for Gabby" he kissed her on the head then dashed into his car and drove off.

"Sofia this is Shay and Shay this is little Sofia Dawson" Shay slid out of her seat.

"You take her in the back and I'll drive." She jumped into the other side of the Ambo.