A/N – Wow, the response to the first chapter was so overwhelming. I really hope I don't let you down with this. I'm hoping to update weekly(ish), but we shall see… Enjoy!

Voight marched towards his office, a mug of coffee in hand. Just before he reached the door he turned to Jay and cleared his throat.

"Halstead?" He barked again. "Off limits. You understand me?"

Jay nodded. This new partner situation could turn out to be a lot more difficult than he had imagined.

Chapter 2

"Thanks, Hank," Erin called out at Voight's closed door.

Everyone else exchanged glances, eyebrows raised at the familiarity their newest detective had with the boss. Jay took the opportunity to address Erin for the first time since she had arrived at the station.

"Erin," Jay started. "I mean Lindsay. Erin Lindsay," Jay winced as he heard Antonio snort behind him. "I'll give you a tour of the precinct?"

Erin nodded and placed her bag down by the nearest empty desk before following a mortified Jay out of the room, smiling at the rest of the team. The pair walked in silence through the precinct until Jay opened a door and gestured for Erin to go inside.

"So, this is the locker room," he started weakly as Erin turned to face him, a wry smile on her face.

"And you're Halstead," Erin smirked. "The detective Hank warned me would definitely try to get in my pants is he wasn't around to scare the living shit out of you."

"Well," Jay broke into a smile. "He's not wrong," he said, waggling his eyebrows suggestively.

Erin laughed, rolling her eyes. As the dimples appeared on her cheeks, Jay realised staying away from this girl was going to be near impossible despite Voight's potential wrath.

"So 'Hank', huh?" Jay tried to ask the question casually but it ended up sounding strained.

Erin shrugged, her eyes flitting around the room almost nervously. Jay rested his hand lightly on her shoulder and his voice softened in response to her actions.

"You don't have to tell me; it's okay."

"No, it's fine," Erin replied, leaning her weight into his hand almost unconsciously. "Hank and I are… Close? He helped me out when I needed it most and he's a bit protective."

"You can say that again," Jay grinned, his thumb rubbing circles on her shoulder. He desperately wanted to ask more but he could tell from her demeanour that she wasn't ready for that. At least, not yet.

"He can be a bit of a softie really," Erin started but Jay scoffed.

"Easy for you to say; it's not your balls that will end up in a jar in his office," Jay scowled as Erin laughed again.

"My balls, eh?" She arched an eyebrow. "I thought you would know I don't have those…" She stepped closer to Jay, biting her lip slightly to stop a laugh from slipping out.

Jay shifted slightly, adjusting his pants as he did so and Erin got a slight thrill from the effect she could tell she had on him. She knew this was a terrible idea, and yet, she couldn't seem to keep herself away from this man.

"Erin," Jay breathed, the pair standing far closer than was strictly necessary. "You're killing me here."

A rattle at the door made Erin spring back and turn as though inspecting one of the lockers. Antonio poked his head round the door and Jay cleared his throat.

"And that will be your locker over there," Jay announced, far too loudly for the small room. "Oh hi, Antonio."

Erin covered a snort with a cough at Jay's blatant inability to stay calm. She hoped he was better when he was undercover because this was diabolical.

"We have a case," Antonio announced, looking curiously between the pair. "Leaving in ten."

"Let's go, Halstead," Erin said loudly, before whispering to Jay. "Stop looking so guilty. I'd rather I didn't have to watch Hank rip your balls off at this time on a Monday."

Jay gulped, nudging Erin playfully with his elbow as she walked past him to the door, faking a pout in response to her dimpled smirk.

"Thanks for that image, Lindsay," he muttered sarcastically. "Real reassuring."

Erin merely winked at him as he walked through the door, following Antonio back upstairs to get her gear before they set off.

"And by the way, partner," she called out. "I'm driving."

The team sat in Molly's that evening having finished paperwork on the open and shut case. The only reason they had even been assigned to it was that the victim was a friend of the police chief. Voight suspected the chief would distance himself once he found out his friend had been killed as a result of not paying debts on a rather expensive gambling habit.

Looking over at the bar, Voight inspected Halstead and Lindsay who were standing together having volunteered to get the next round. The pair had got on well all day and although he trusted Halstead to have Erin's back, there was something he couldn't quite put his finger on. He turned back to the team as the pair started walking back to the table; he'd made his point clearly enough that morning and even Jay Halstead wouldn't be stupid enough to cross that line under his watch.

Voight kept an eye on the pair for the next hour until he left, giving Jay a stony glare as he walked out the door. The slight wince on Halstead's face in response left Voight feeling eerily happy.

Eventually, only Jay, Lindsay, Burgess and Ruzek remained. Ruzek kept whispering in Burgess' ear and the two exchanged several meaningful gazes before Jay finally stepped in.

"Guys, just go home already," Jay groaned, wrinkling his nose in disgust.

The couple put up little argument and Ruzek pulled Burgess out of the bar less than a minute later, leaving Jay and Erin alone.

"Thanks for that," Erin grinned. "I thought they might end up having sex in front of us at that rate."

"Yeah, as soon as Voight leaves they always get the PDA on," Jay complained. "It's not like the rest of us want to see it either."

"You're just not as scary as Hank," Erin teased.

"You wouldn't like me so much if I was," Jay returned with a wink.

"You're alright, I guess," Erin smirked. Looking down at her watch, she sighed. "It's nearly midnight, we should probably head off; don't want to be exhausted on my second day."

"Come on then, Cinderella," Jay scooped up Erin's coat from the back of her chair. "Let's take you to your carriage."

"You're an idiot," Erin laughed, leaning her weight into Jay's side as she stood next to him. The two exchanged an intense stare and Jay suddenly felt himself feeling breathless. Damn her and her ability to affect him so much with a single touch.

The pair walked out together and headed slightly away from the entrance to the bar so they could avoid the smokers near the door.

"So," Erin started. "Thanks for a good first day, Halstead. I know you've got my back."

"Always," Jay replied, his voice far too soft for just a conversation between colleagues.

Erin looked up at him, conscious that the level of alcohol in her blood was lowering her inhibitions. She knew she shouldn't, but she couldn't help but reach up and run her hand along the line of Jay's jaw, slowly tilting his head down towards hers.

Jay's mouth crashed down on hers and she welcomed it, responding eagerly. The kiss seemed so much more exciting with the knowledge that it was forbidden and she wanted nothing more than to drag him back to her apartment right then and there.

Jay pulled back abruptly and Erin looked up, questioning him with her eyes.

"Erin," he whispered. "We can't."

"I know," she sighed. "I know we shouldn't. But fuck if I don't want to."

Jay laughed, his hand softly stroking her arm, his mind arguing with itself about whether he should just give in. Fuck Voight, fuck the job; right now, all he wanted was Erin.

"You're not the only one."

"Maybe one day," Erin smiled wistfully and Jay scoffed in response.

"Definitely one day," he grinned, intertwining their fingers. "But for now, it's time to get you a cab and then I need to go home and have a very cold shower."

"Sorry about that," Erin smiled coyly, not looking the least bit apologetic.

"You're going to be the death of me, Erin Lindsay," Jay rolled his eyes, draping Erin's coat around her shoulders before raising an arm to attract the cab that was rolling down the street. He gestured for Erin to get in and was about to shut the door when he heard her voice.

"You sure you don't want to share a cab?"

"Don't tempt me," Jay took a deep breath in, shutting the door and watching as the cab turned out of sight at the next intersection. He ran his hand through his hair slowly.

"Fuck," he said to no one in particular. "I need another drink."

A/N – I hope you enjoyed it. Reviews make me happy. Also, this may not be the place, but a little boy in my town has cancer and we are raising funds for an operation in the US. I will post a link to an article about him on my profile and it would mean so much to me if you had a read/shared it/donated. Freddie is a lovely kid and this surgery could save his life. Thank you.