Hi everyone! I've been loving the Brettsey content on this site recently, so I figured why not add some more to it?

This is a random little Brettsey oneshot that I pulled together... considering making this story into a series of Brettsey oneshots, so let me know what you think!!

Be sure to check out my previous Brettsey oneshot if you already haven't!

1. Hot Summer's Day

It was a hot summer's day in Chicago and the squad's shift was about to begin. The hottest days were often the worst to be working on. Their gear just felt ridiculously uncomfortable and there was little they could do about it, but there was something else that Matt Casey knew would make the day even more uncomfortable for everybody.

He rushed through the door of Firehouse 51 and into the lounge, relieved to see that everyone was already there getting their breakfast.

"Guys, listen up, I need to make this fast" he said as he quickly looked over his shoulder and everyone looked at him, completely confused. "Sylvie is about to walk through the door and uh - she isn't taking this heat well." He explained as everybody gulped.

"How so?" Foster asked quietly, knowing that a storm was brewing.

"You know she's been uncomfortable anyway for the past few weeks but it's really hitting home today and she's uh - she's really not in the best of moods..." Matt warned. "You're all going to take some hits. Some brutal, personal hits... but please remember the kind and sweet Sylvie that you all love so much is still in there and that it's the heat and the hormones talking. Just - be tolerant. Please." He practically begged as everyone nodded their heads with uncertainty. None of them were entirely sure what storm would be coming their way.

Suddenly, the door swung open and Brett waddled into the lounge with a deep scowl on her face.

"Matthew Casey" she began as she dropped her bags and put her hands on her hips. "Is there a reason that you left me to get out of your damn truck and lift my bags by myself?"

"I uh - I just wanted to make sure there was a space for you on the sofa, just to make you comfortable -" Matt said, stumbling over his words.

"Uh yeah, cause that's what I freaking deserve and it's damn impossible to achieve!" She exclaimed as she wandered over to the sofa and awkwardly lowered herself down on it and rested her hand on her protruding belly.

When Brett and Casey discovered they were having a baby, they were completely and utterly over the moon. Nothing had felt more right and timing finally seemed to be on their side. They had been married for 2 years and together for 4. At first, Brett loved being pregnant. She had a real glow about her and sweet Sylvie somehow became ever sweeter.

But then - the morning sickness kicked in. She thought she'd escaped it but no - it appeared it was a late start. She was constantly chucking her insides out and it stopped her from doing her job, resulting on her being put on desk duty a lot sooner than anticipated. That was step one in the disappearance of sweet Sylvie Brett.

Step two was when they went for their 10 week scan and found out they were having twins. It was a shock, they were excited but also freaked. Two babies was a lot. Plus, Sylvie felt like she was growing at an alarmingly fast rate and the day she couldn't see her toes anymore was the day her mood deteriorated significantly. She loved that her babies were growing inside of her. It was fulfilling and exciting - but she missed her toes. She missed being able to get off the sofa by herself and not having Casey constantly having to pull her to her feet. She missed being able to tie her shoelaces by herself. She missed the simplest little things.

Step three came when the heat wave hit. Sylvie was 2 days away from her due date, but a part of her was convinced she would be pregnant for an eternity. She was beyond uncomfortable and hot and outrageously big and she was just fed up with being pregnant. She needed these babies out of her ASAP.

Casey wanted more than anything to relieve her discomfort. He hated seeing her so miserable and he missed her sweetness - but he knew it would be entirely worth it when their babies got here. Casey was also feeling a little uncomfortable - but for entirely different reasons. Brett had the air conditioning on full blast in their house, meaning Casey was freezing and went to bed every night with a coat and gloves on. He couldn't understand how Sylvie would lie beside him in her underwear, the duvet completely discarded. A pregnant woman's body truly was a remarkable thing. Plus there was the fact that Syvlie's bad mood was often taken out on him - but he took the hits cause he knew she didn't mean it. It was normally incredibly stupid things like telling him his hair was a total mess.

Since Brett had been in a particularly foul mood today, Casey knew he had to warn their colleagues. They'd already witnessed a few of her bad moods, but he knew they wouldn't have witnessed anything like this before. Matt had suggested she stay at home considering her maternity leave had started, but no. Brett insisted on coming in and bothering everyone at 51 instead.

"My god it's so hot!" Sylvie exclaimed as Stella quickly brought her a cold drink. "I didn't sign up for this. I signed up for the sweet miracle of life. The pregnancy glow. This - this is what hell must feel like and I am being tested. These babies owe me. Big time."

Nobody really knew what to say to Brett. They were scared they would somehow bother her further.

"That's great Cruz, breathe a little louder why don't you?" Sylvie suddenly snapped as Cruz looked up from his newspaper confused. He was sitting in the opposite end of the room. Somehow she now had supersonic hearing?

Before anything else could be said, the bells for a call went and everybody rushed out.

"Oh don't mind me, I'll be fine right here, pregnant and miserable!" She shouted as Ritter through her a bag of ice on his way past. "Now this is the kind of TLC I need, Matt Casey take note" Brett said as she put her feet up, opened the bag and began sucking on the ice chips.

"You're doing great baby, I love you!" Matt said as encouragingly as he could before he rushed out the door, secretly thankful for what he was calling a break.

In the time that they were gone, Brett's mood hadn't changed. When they came wandering back in a few hours later, Brett had greeted them from the same position on the sofa.

"Yep, you guessed it, still pregnant!"

"Is drugging pregnant women frowned upon?" Capp had grumbled. They all contemplated it for a moment, but soon realised they were being ridiculous.

That night after getting home, Brett had run herself a cold bath in an attempt to cool her down even in the slightest bit. As she lay surrounded by bubbles and her bump protruding over the top of the water, her mood had somehow changed from grumpy to deflated. She hated what this was doing to her. She wasn't sweet Syvlie Brett anymore. She felt like a crazy person. She wanted to be able to enjoy her pregnancy but this heat just wasn't letting her.

She heard Matt come in to the bedroom after his evening run and waited for him to walk in to their ensuite. Normally, she would have called him in immediately to help her get out of this damn bath, but not tonight. He probably needed his space. Soon enough, however, he appeared in the doorway and leaned against the frame.

"Hi" he greeted with a quiet and amused smile. Since she hadn't called for him the moment he walked through the door, he figured her mood had maybe changed a little since earlier. Even just looking at her now she appeared calmer.

"Hi" she replied quietly. "I'm sorry" she apologised.

"For what?"

"Being an ass..." he grumbled.

Matt smirked and sat down beside the bath, reaching in and taking her hand. "You are not being an ass. You're uncomfortable and I know it's not an easy thing to deal with... I cannot tell you how much I love you and admire you for how you've handled yourself for the past 9 months" he told her as he ran his thumb over her hand. "Yeah, you've had some tough days..." he said as Brett scoffed. Everyday felt like a tough day. "But you're housing two humans in there. That's not an easy thing to do and I know all of this will be entirely worth it once we meet our babies." He encouraged.

Brett looked at him for a brief moment before bursting into tears. Matt sprung to his knees, alarmed by her actions.

"Wow, what's wrong?" He asked.

"You always know the right thing to say!" He exclaimed through her tears as Matt furrowed his eyebrows.

"And that's a problem...?" He asked, raising his voice at the end as if he was asking a question.

"NO, it's just so you and I love you so much for it and my hormones are all over the place and I want nothing more than for someone to massage my stomach because they won't stop kicking my pelvis and I need something else for them to fight against!" Brett rambled as she tried to control her tears.

Casey let out a laugh and ran his hand over her hair before sighing, "I guess we better give you that massage then" he said before standing up, stripping down and climbing into the bath behind her.

"What are you doing?! It's freezing in here" she warned as he let out a light hiss and the temperature, but persisted none the less.

"I have walked through fires, I think I can deal with a little cold..." he said as she positioned herself comfortably between his legs.

Casey kissed down Brett's exposed ear and neck as his hands ran over her stomach to find where the babies were kicking. Once he felt the pressure against his hands, he gently rubbed up and down and soon enough, the kicking subsided.

"I haven't felt this comfortable in a long time" Brett said quietly as Casey smiled against her temple.

"I'm glad" he replied as Brett relaxed further against him. They managed to stay like that for a solid 7 minutes before Sylvie sat up and yelped

"OW!" she exclaimed as she grabbed onto her stomach.

"What? What happened?" Casey asked desperately.

"I uh... I think I just had a contraction" Brett said through her teeth as she felt another one hit her.

"It's happening? Now? Right now?"

Brett rolled her eyes, "No Casey I'm pretending to be in this much pain because discomfort is all I have known for the past 9 months!" She snarked

Apparently it had been too much to ask for just 10 minutes of comfort. Apparently it had also been too much to ask for an straight forward labour. 36 hours after her bath, two screaming yet perfect baby boys came into the world.

Jack Boden Casey and Elliot Otis Casey were more amazing than either Brett or Casey could have imagined. In an instant, all the discomfort and pain had been forgotten when they looked at their baby boys. Nothing else mattered and Brett easily knew this was the best thing she had ever done, and she would look back on her pregnancy with fond memories, because it enable her to welcome her boys into this world.

She was just about ready to bring sweet Sylvie back into the world and everybody was just about ready to welcome her back. Pregnancy had changed her - but definitely for the food. She knew Jack and Elliot Casey would always have her wrapped around their little fingers and she was excited to watch them grow and take on the world.

Besides, a little discomfort never hurt anybody.