Hey, so this is what happens when you are bored on a Wednesday night, not really a writer but thought I would give this a go. The idea has been stuck in my head for a while, and am just going to pretend that Erin and Jay have been partners for like 4 years, CF characters do make a tiny appearance. Please review, at this moment in time I wrote it as a one shot but I think I could think about making another part or a few more depending on how people like it :)

Please review.

Lying in bed on a Saturday morning listening to the sounds of laughter, this was not the life Erin Lindsey had imagined for herself at 28 years old, a detective in the Chicago Police Department, and a 3-year-old daughter, but some how this was her life. She had no real family to speak of, only the family that she had made in the CPD, and of course Voight the man who had saved her from a life of, well god only knows what could have happened if he hadn't insisted on helping the teenage girl.

"Opppps, Mommy, help me please" Erin heard her daughter call out to her, throwing the covers off herself, she pads out of the room over the room across the hall and she sees that Harper isn't in her own room, she then moves off into the kitchen to find her daughter sitting on the floor covered in flour smiling up at her.

"Hmmmmm, what do we have here Miss Harper?" Erin asks her daughter trying to keep a straight face.

"Well today is the day that my daddy gets married right!" Harper asks her mother innocently.

Erin looks at her daughter and nods as enthusiastically as she can.

"So I was thinking that I would bake them a cake, or well maybe cupcakes" Harper finishes not noticing in the change in her mothers face.

The truth was Harper's father was one of the good guys that had been in Erin life, if not the best, they had tried to have a relationship but with work, and Erin's commitment issues they hadn't worked out, 3 months after the break up, they found out that they were going to have a baby together, still Erin wouldn't commit and said she would understand if he didn't want to be in the baby's life, even though she knew that would never happen he was far to nice to do that to her.

Erin soon snapped out of memory lane and walked over and picked her daughter up off the floor and sat her on the worktop,

"Look sweetie that is a really nice idea, and am sure Daddy would love it, but the thing is, they already have a cake, and the brides mommy and daddy would be sad if they didn't use the one they bought. Do you understand?" Erin tried to break the news to her gently that the cake was already done.

"Yup, but Momma, are you sad?" Harper asked noticing the change in her Mothers eyes.

"Not sad sweetie no, just disappointed that we couldn't make this work" Harper looked at her mother with confused eye and Erin realised her mistake. "The cake I meant sweetie" Yeah nice save Lindsey, she thought to herself.

A few hours later whilst helping Harper pack her stuff for what she had heard people call the wedding of the century did she allow herself to wish she had given him a chance when Harper was born.

Flashback

Erin stared down at the tiny 6lb baby girl being held by her Daddy,

"We did good, huh?" She asked him whilst he sat next to her on the bed.

"Yeah we did, however you did most of the hardwork and it made me realise how much I love you," He said gazing down at her.

"Please don't" She begged "We tried and it didn't work, and yes we have a baby but" she was cut off by 2 words she would have never expected to come out of his mouth.

"Marry me"?

End of flashback

She had her chance and now she had to deal with repercussions of saying no to him that night.

Standing outside of his apartment on the day of his wedding was not something she ever imagined herself doing, as she knocked and waited for the door to open, she realised that she didn't want him to do this and marry someone else she wanted him.

"Daddy" Her thoughts were interrupted but him opening the door and the brunette little girl running into his arms.

"Hey prinny, listen why don't you say bye to mommy and then go inside and find grandpa" He told his daughter, she did as she was asked and kissed her mommy goodbye "See you at the church right mommy" Erin just nodded to her, not having the heart to tell her she might not go to the church.

"So have you decided if you coming yet, because I really want you there, your one of my best friends, and Harpers mother" He asked her.

"Wont your bride to be find it a bit strange" She asked him bitterly having had run ins with her in the past over Harper and her man as she so kindly tells Erin.

"She knows what you are and who you are to me Erin, nothing is going to change that.

"Okay I will see you there then." Erin told him and started to walk away.

"Tell me not to do it, tell me I am making a mistake" She heard him whisper down the hallway, she pretended not to hear him, and carried on walking.

With a heavy heart and tears clouding her vision, she walked into Molly's and ordered a vodka shot from Dawson who was busy making the final arrangements for the wedding reception.

"Bad morning" Gabby asked her.

"Yep, dropped Harper off with Daddy dearest and he said something and I pretended not to hear him" She said sadly.

"Come on Erin, what happened" Gabby asked seeing her about to start bawling.

"I heard him say tell me not to do it, tell me I am making a mistake".

"And I just walked away, I had my chance when Harper was born, everyone knows I screwed up.

"And us three all know that, if you went and told him how you felt you would be the one in his bed tonight" She heard Severide tell her.

"But…." She tried

"No buts Er, please go and tell him and stop moping about, because I just left him at the church and he is a nervous wreck, he doesn't want this, you know that and I know that and so does the whole of CPD and CFD"

Jay Halstead stood in the back of the church with his little girl stood at his side asking all the questions that had been in her little mind since her mother dropped her off, why are you marrying Ally?, Why not my momma, and all Jay could say was because your mommy wanted us to stat friends, not because I love Ally, in actual fact if Erin turned up now and told him not to go through with the wedding he wouldn't do it he didn't think.

"Momma, you're here." He thoughts where interrupted by his 3 year old daughter.

He took one look at her, and he wished he was marrying her, there she stood in a gorgeous floor length blue dress, minimal make up and her hair slightly curled and put up to the side, then he remember she had turned him down, twice if you counted the apartment scene earlier on.

"Hey, Jay" Was her simple reply as she picked up their daughter.