This is something I thought of when I thought of as a crossover for OTH and Chicago PD, what if Lucas and Brooke had a one night stand near the end of graduation? And she left to Chicago and Voight helped Brooke out and basically everything in Chicago PD except Erin's background is changed and she has a kid. Plus everything in OTH is the same except no C over B, Jamie is still alive from that storm also. That won't really be that important right now but, just in case anybody had any questions about that just let all of the things that Brooke made happen(except C over B) still happened except without Brooke. Just with somebody else helping, I guess. Hope you enjoy!

Prologue: Leaving Tree Hill

It was the one time, the night before they broke up, that it happened. The one night that changed Brooke Davis', or should I say Erin Lindsay's, life forever.

" , where are you going?" Peyton asked walking into Brooke's room, seeing her packing a suitcase.

" , you have to stay here, okay? You have to stay with Lucas and live happily ever after. And-" She was cut off as Peyton grabbed the clothes from her hands and looked up at her.

"What has gotten into you, ?" Lucas Brooke thought. "We were gonna go to L.A. remember? Where are you going?" She said picking up the bathing suit from off of the bed and putting it in the suitcase.

"I'm gonna go to Chicago and you're going to stay here or go to L.A., I have some people in Chicago there to live with until I can get on my feet. I just need somewhere to get away from… things." Brooke said going towards her dresser And grabbing the last of her clothes.

"What do you need to get away from? I thought that we were gonna spend the summer together,we were gonna leave today, what happened?"Peyton asked as Brooke zipped up her suitcase. Brooke couldn't decide whether or not to tell her, but she did what she always did when she couldn't decide over something, like shoes or a dress or something like that. She mentally flipped a coin and decided to tell her.

"I'm pregnant."She mumbled barely loud enough for Peyton to hear her.

"You're what?" Peyton almost yelled. Brooke took the suitcase off of her bed and sat down next to Peyton.

"You have to promise me that you won't tell anybody, ok? Not Haley or Lucas or any living soul, okay?" Peyton nodded in response, "Okay, you know that I love you and I always will , and I can't wait for you to become an aunt." Brooke words caught Peyton by surprise, leaving her with her jaw dropped. "I found out last night after the party and decided to go to Chicago, there's somebody there that will help me and I trust him with my life. I just have to go, it'll be good for me. Just to get away, and I'll try my best to be back for the four year thing and our high school reunion. You can visit me and everything but you can't tell anybody where I am until I tell them ok?" Brooke said her eyes forming tears. Peyton sat there, speechless.

" , you know I love you, too and will always keep your secrets secrets but, who's the father?" Peyton asked not expecting an answer, and if Brooke lied Peyton would understand and let it go.

"I don't know." She lied and both of them knew it but Peyton knew that there was a reason for that and she would let it go. "You need to stay here and make your own record label, ok? And you and Lucas are gonna get married or someth-"

"Brooke, I'm still gonna go to L.A. and take that internship, I guess that I just hoped that you would come with me." Peyton cut her off, and an idea popped into Brooke's head.

"You could come with me for the weekend or something, I have to leave at 4 P.M., so if you want to text me or go and get your suitcase, like now cause even though it's noon we still have traffic and security and go say bye to Haley and everything before the plane." Brooke said, Peyton stood up and Brooke followed her towards the door.

"See you in about twenty minutes, ." Peyton said leaving the apartment to get her suitcases and say bye to her boyfriend.

About five minutes later Brooke grabbed her suitcase and headed downstairs towards her car and went to pick up Peyton before they went to see Haley.

Brooke arrived at Peyton's house and honked the horn,signaling to Peyton that she was there. Peyton came out of her house with her suitcases, Lucas stopping and watched her walk towards the car while leaning against the door.

"Bye!" Peyton partially yelled after putting her stuff into Brooke's trunk and climbing into the passenger side door. Brooke waved bye and Lucas nodded in response. Brooke started to drive to Nathan's house to talk Haley into driving them to the airport.