A/N: Hey! So, I really shouldn't be starting a new story but this one has been sitting in the vault for a while now and I finally am ready to start sharing it.

This story is dedicated to Danielle and Laura, both of whom wanted a Linseride story where they still stay friends when they break up, and actually help each other get together with their future partners; Jay and Anna. I hope you guys like it :)

Enjoy!

"You do realise that I'm a cop right?" Erin says as she tries to suppress her chuckle.

"Erinnnnn. Just, let me be alright?" Kelly whines as he shoves his shoulder into the door of Shay's apartment.

"Dude, you're breaking and entering." She says as he bangs his shoulder into the door again.

"Dude. Shay said I could crash here." Kelly sasses back.

"I'm pretty sure she didn't say you could break down her door!" Erin laughed.

Kelly smiled triumphantly as the door pushed open, the chain lock on Shay's door breaking apart and landing on the floor with several loud ding!

"You do realise you could've just stayed at my place until she got home right?" Erin asks as she settles down on the couch.

Kelly smirks as he hands her a beer bottle, sitting down next to her "If I stayed at your place, I wouldn't have left."

"What's so bad about that?" Erin teased.

Kelly smiled leaning in to kiss her neck "Nothing really, but I did promise Shay we'd hang out tonight. Can't exactly stand up my roommate date now can I?"

Erin giggled as his breath tickled her skin "You're such a dork."

"You love it." He said proceeding to press his lips against hers.

"Shay's going to be home any minute." She mumbled against him.

Kelly just shrugged and kept kissing her "She can wait a little longer."

...

"What the hell happened to my door!?" Erin sat up as she heard Shay's voice shriek through the apartment "Kelly, what the hell did you- Oh."

Erin felt her cheeks heat up as she held the thin sheet tightly against her bare chest, wishing she could sink into the bed and be invisible.

"Hi Shay." Kelly said casually, arms folded behind his head as he watched Erin's embarrassment with amused eyes.

"Kelly Severide, why is my lock chain broken?" Shay said focusing her attention back to him.

"I left my key at the firehouse and, well, I was a bit desperate to get inside." He replied eyeing Erin.

Shay smirked as she and her friend took in the flustered cop "I don't blame you." She said with a wink before walking back out of the bedroom "Get your ass in here before I start the movie without you!"

"Oh my god." Erin groaned as she dropped her head into her hands. She looked up and reached behind her to slap Severide's chest as he laughed "It's not funny!"

"Oh come on, Shay's harmless." Kelly said nonchalantly "Besides, like she could compete with me."

Erin rolled her eyes as she got up from the bed and began putting on her clothes "If that's what you need to believe."

"Wait." Kelly said sitting up in the bed "Are you saying you'd prefer my best friend over me?"

Erin gave a cheeky smile, pulling her top down and leaning over to kiss Severide's cheek "See you later babe."

"Oh you're in trouble now." He said, sporting a sly grin as he stood up "Erin!" he called as she raced out of the room.

He quickly pulled on his boxers and track pants before scrambling after her, stopping short in the living room when he heard the door shut.

"Jeez Kelly, just how bad was it?" Shay laughs as he sits down next to her "If you want some tips, I'd be happy to show Er-"

"Don't even think of finishing that sentence." Kelly grumbled.

Shay smiled leaning her head on his shoulder "Alright, clearly someone's sensitive tonight. What movie are we watching?"

"I don't care, whatever you want." Kelly shrugged.

Shay looked up at him, an exaggerated look of shock on her face "I'm sorry, is the Kelly Severide letting me pick the movie?"

Kelly rolled his eyes as he looked down at his phone, smiling at the text he saw from Erin.

Thanks for tonight, however short-lived it may have been...

Kelly chuckled softly before sending a quick reply.

Definitely your place next time ;)

His phone buzzed again but before he could check the text his phone had been pulled from his hold and was now securely in Shay's hands, who was now typing out a message.

"Damn, detective gives as good as she gets." she said when the phone buzzed and she quickly typed back a reply.

"What did she say?" Kelly said trying to reach back to grab the phone.

"Nope." Shay said tucking his phone into her pocket "You and me night. No interruptions."

"Shay!" Kelly whined for the second time that night "Come on, just let me talk to her."

Shay looked at him for a few minutes, her voice softer when she responded "You really like her don't you?"

"... She's the first girl I've ever truly felt comfortable to be myself with in a long time."

"Ugh, fine. This is too sappy for me." Shay replied pulling his phone back out and tossing it to him "You've got it bad Kelly."

"I know." He smiled before looking back down at his phone "Wait ... Did you proposition my girlfriend!?"

Definitely your place next time ;)

Erin smiled as she read the text, before sending a simple reply Definitely. At least I won't have to sit out on the side of the street while you hang out with your other girlfriend.

She was pulled from her screen when she saw the headlights shining on the street, and looked up to see the 300 approaching.

You could always come back up and have some fun with us...

Erin couldn't help but laugh at the response. 'Only Shay' she thought to herself, before typing out a response.

Don't tempt me babe, we both know you'll lose x

"Hey, you planning on freezing your ass out there all night? I'm happy to drive back to my apartment." She rolled her eyes at her partner before getting inside the car.

"Thanks for coming to get me." She said as she buckled herself in.

Jay smirked looking her up and down, noting her messy hair and the wrongly aligned buttons of her shirt "Walk of shame already? It's only 10.30 Erin.'

"Shut up." She grumbled "Kelly and Shay are hanging out tonight, I didn't want to interrupt."

"So does that mean we're watching the game together?" Jay asked as he started driving once more.

When no response came, he looked over at the next red traffic light to see Erin smiling down at her phone.

"You've got it bad." He said looking back at the road as the light turned green.

"You have no idea." She said softly.

A/N: Okay, so this is kind of a short chapter but it's sort of a prologue I guess in a way? Anyways, hope you guys all like this story idea and keep reading to see just how Erin and Kelly go, as well as how Linstead and Severanna come to be!

Please leave a review and let me know what you think, and if there's anything you'd like to see happen in the story I'm happy to try and incorporate it just let me know in your review. Thanks for reading!

- Maddie :)