Hey everyone! This is my first chicago pd/chicago fire crossover! The idea came to me in a dream, so I hope you like it! Reviews are much appreciated and I most definetely take suggestions! So if there is anything you wanna see, let me know! Just keep in mind that this is AU! It's also very Lindsay/Severide centered! I'm also gonna through some Dawson/Casey in there! Shay is NOT a lesbian in my story. I'm debating a Clarke/Halstead love triangle, let me know what you guys think of that. Okay so here is chapter one! Give me lots of feedback!

CHAPTER ONE:

Erin Lindsay was sitting in the doctors office patiently waiting for her boyfriend to join her for her 20 week check up. Erin and Kelly Severide had been hooking up for about 3 months before she found out that she was pregnant. It was definitely something neither of the were prepared for. With both of them having risky professions, bringing a baby into this world was the last thing either one of them wanted or needed. The first few weeks were rough, so rough that Erin went almost a whole month without talking to him. Erin was set on an abortion but Kelly couldn't have been more against it. However when Erin heard her baby's heartbeat for the first time, she knew that she had to have it. She didn't want a baby, but she wanted this baby. Kelly was so relieved and when the reconciled, he asked her to officially be his girlfriend. That was a few months ago and things were really going well for the pair. For the first time in her life, Erin was truly happy.

"Hey babe, sorry I'm late, chief called a last minute staff meeting before the end of shift." Kelly said as he kissed her on the forehead before sitting down next to her. He looked around the doctors office and noticed all the other patients that were also waiting to be seen. There were other pregnant women and there were also infants waiting with their months to be seen. Kelly couldn't help but smile. He was actually really excited about this. He knew that Erin would make a great mother and even though he had a rocky relationship with his father, he knew that life was what you make it and he would do the best that he could.

"No worries, the doctors office always says to be here at a certain time but then it takes another hour before they see you." Erin said as she rolled her eyes while flipping through the magazine she was looking at. Erin was excited about motherhood but she was also nervous. She didn't want to give up her career. However she also had doubts in the back of her mind, was it really fair to have a child when you were a detective in one of the most dangerous units in the city? She couldn't help but think about tucking her baby in for bed, going to work and then never coming back. Erin shook herself out of her thoughts when she heard the nurse call her name. Erin and Kelly stood up and followed the nurse to the exam room. Kelly had gone to all of his girlfriends appointments and he really enjoyed being involved in the whole process.

"Alright Ms. Lindsay, it looks like today were are going to do some routine blood work, check on the baby's heartbeat and do an ultrasound." The nurse said as she took Erin's weight. "We should also be able to find out the sex if you are interested." The nurse said. Kelly and Erin just looked at each other smiling. The definitely wanted to find out the sex. "It looks like you have lost 2 pounds since your last appointment. Erin, this isn't uncommon, but dad, I need you to make sure that she is eating right." The nurse said as she put the blood pressure cuff on Erin. Erin was on the small side, she's always been kind of petite, and it was no secret that she didn't have a whole lot of time to eat healthy. Being a cop, you didn't exactly have time to sit down and eat a decent meal. Kelly made a mental note to keep an eye on her eating habits. After all, he did feel like it was his responsibility to make sure that his girlfriend and his baby were safe.

The nurse told them that her blood pressure was perfect, and told her to pull her top up and the doctor would be in soon. Kelly looked down at her belly and smiled. She wasn't huge or anything but it was obvious that she was pregnant. Erin noticed he was looking at her and she blushed. "What?" She said with a little giggle. "Nothing, I just think you're freaking adorable" he said grabbing her hand to hold it. "How are you feeling today babe?" Kelly asked her. Over all she had been having an okay pregnancy. The morning sickness was kind of unbearable at times but she was starting to feel like that was over. "I feel great today, I just have to pee so bad!" Erin said with a laugh. She had to drink 32 ounces of water before every appointment so that the ultrasound would have a good picture of the baby. Kelly just laughed.

"So, I talked to voight like you asked me and he said that he will make sure I'm not directly put in harms way. As my pregnancy progresses, Platt will have more desk work for me to do. Then I'm taking 6 weeks off when the baby is born and then I'll be back in the unit full time." Erin told him. She knew that he had reservations about her working in the intelligence unit once she had the baby, but every time he brought it up, she just reminded him that it's just as dangerous to have a firefighter as a father as it was to have a cop for a mother. So they would argue about it for a few minutes and then reason that they would just talk about it at a later date.

Kelly just nodded and looked at her. Erin was stubborn and it didn't help that they were bought pretty set in their ways. It worked for them though. Erin looked up when she heard the door open and her doctor walk in. Kelly and Erin both smiled at her and waited for her to reveal the gender of their child.

About 20 minutes later Erin and Kelly left the doctors office arm and arm. "I'm so excited that the baby is a girl! We need to go shopping!" Erin said as she moved so she was standing in front of Kelly and waking backwards. He just laughed. "Guess it's a good thing we have a lieutenant and a detectives salary" he said with a laugh. Erin had been waiting so long to find out the gender of the baby so that she could go shopping. "Are you excited that it is a girl?" Erin asked him with a serious face. She knew he secretly wanted a boy. "Definitely. It makes it all feel so real now that he know." Kelly said with a smile. "So, Juliette Andrea Severide? Is that still what the name is going to be?" Kelly asked her. They had decided that either way they wanted to honor Jules and Andy. Both friends and colleges who lost their lives on the job. If the baby was a boy his name would have been Andrew Julian Severide.

"Definitely!" Erin said as she kissed him softly on the lips. "Come on, you need to take me shopping and feed my belly before I go on shift tonight!" She said as she started to drag him down the street.

Okay, what do you guys think?

Things coming up:

Interactions at the firehouse and the precinct. Other characters make an appearance.

Hank and Severide have an altercation.

Kelly and Lindsay baby fluff.

And more!

Let me know what you guys wanna see happen and I need honest opinions of the story so far (: 5 reviews and I'll update!