The next morning, Jay wakes up still emotionally exhausted, even though he slept through the night without having any nightmares. Dragging himself out of bed, Jay takes a quick shower before taking Casper outside.

Once the two are back in his apartment, Jay puts on his coffee so it can brew while he is feeding Casper his breakfast and making sure he has fresh water. Once Casper is happily eating his breakfast, Jay puts a bagel in the toaster for himself. While he is waiting for his bagel to toast, Jay checks his e-mails. First checking his work e-mails, to find many reports from the different departments that he needed answers from for his cases and paperwork he still needs to fill out. He then checks his personal e-mail account to find a lot of spam, but one sticks out to him; it is from Liam, reminding Jay that he needs to take Casper to a vet next week for his next round of puppy shots, included in the e-mail is a list of what shots and rounds of each shot Casper had already received. Jay makes a mental note to ask Will what vet he takes Kohl to.

When his bagel pops up, Jay grabs it, looking at the time he sees that f he doesn't hurry he's going to be late. "Casper, come on. Go in your cage." Casper does as he as he is told, looking at Jay with sad eyes, "I know Buddy. I'll be back at lunch to let you out," Jay tells the dog as he puts his water bowl in the cage.

Jay grabs his bagel and leaves, getting to the district just in time.

With the home invasions case still open, Voight has the team tearing apart every lead and clue they have, in hopes to find an answer for the families. Everyone is hitting up their CIs, knowing that if they don't find something soon, there is the possibility that Voight will go rogue to solve the case.

Around ten Jay gets a text from his brother, Hey, meet me for lunch? My shift doesn't start until two.

Can't, he answers back, tough case and I'm using my lunch to go home and let Casper out. Drinks tonight instead?

I don't get off until ten.

Come over after? We can watch the rest of the Hawks game?

I need to let Kohl out. My place instead? You can bring Casper.

Okay, sounds good.

Okay. Be safe.

Jay rolls his eyes at the last text his brother sends.

"I might have something," Kevin announces.

"What is it?" Voight asks.

"It's a bit of a stretch, but each family has had someone in their home that has a connection to a Seamus Glennson. And he has quite a long wrap sheet; starts at fourteen with petty crimes and escalates to more violent crime including rape and gang-related crimes by the time he's eighteen."

"Okay, let's bring him in. Atwater, take Halstead with you," Voight orders.

Hailey looks up when she hears Voight telling Kevin to bring Jay with him. Not that she doesn't trust Kevin to watch Jay's back, but at the moment, she doesn't trust that Jay is okay mentally. Sensing eyes on him, Jay looks over at Hailey, who gives him a look. Knowing what she is trying to communicate, he gives the signature Halstead smirk, telling her that he is fine, but his eyes say different which does not help Hailey's uneasiness.

Kevin and Jay leave to bring in Glennson.

Arriving at the address that they have, the two get ready to breach when they hear screaming coming from the home. Kicking down the door, Jay sees Glennson on top of a woman, beating her. Jay tackles Glennson while Kevin approaches the woman to check on her. After a struggle, Jay manages to cuff him.

They put him in the back of their car while waiting for the ambulance to arrive for the lady. When it is decided that the lady he was beating will be making a trip to Med, to be sure there are no internal injuries, Jay pulls rank telling Kevin to go with her as he wants to avoid running into Will, in case he was called in early, since the text exchange they've had that morning.

Taking the suspect back to the district, Jay throws Glennson into the interrogation room to let him sweat before he questions him.

Meanwhile, Will decides to find some research of his own since Jay is too busy to meet for lunch. His first question that he wants to find the answer to is the letter of recommendation for the service dog: How severe does one's PTSD have to be to qualify.

Since service dogs fall under the jurisdiction of the Americans with Disabilities Act, or more commonly known as the ADA, Will checks to see if they have a website where he can find the answers that he is looking for.

Unable to find anything on their website, Will finds a phone number to call.

"Hello, how can I help you?" a voice answers the other end of the line.

"Hi, I had a question about qualifications for PTSD service dogs."

"Okay, is there a specific concern you had in mind or is this about qualifying in general?"

"So, I was looking into organizations that pair veterans with service dogs and their website said that the potential handler would need a letter of recommendation to be considered to be paired with a dog. Now we decided to train the dog ourselves because I know my brother wouldn't have gone for the twenty-four-seven training for three weeks, along with the fact that at the time he was unaware that we were looking into this for him. My question is: How severe does someone's PTSD have to be to qualify for a service dog?"

"If you chose to owner-train, there is no letter of recommendation needed. As long as he has a disability he is able to have a service dog with him."

"Okay, does he need to show proof of his PTSD?"

"No. And people are not allowed to ask. There are only two questions that people are allowed to ask regarding a service dog. The first one is: is this a service dog required because of a disability? And the second one is: what work or task has the dog been trained to perform? Anything else is illegal."

"Okay. Thank you for your help."

"My pleasure. If you or your brother have any more questions, feel free to call back."

Hanging up, Will looks at the time and realizes that he has been on the phone longer than he thought. He gathers his things hoping that he won't get caught up in the lunch-time traffic of Chicago. He makes a mental note to let Hailey know what he found out when he has a break.

At the end of the day when Voight finally allows them to leave, the officers of the unit all decide to hit Molly's for a couple of drinks.

"Are you going?" Hailey asks Jay, already having an idea of what his answer is.

"No. I need to let Casper out and he's been in his cage all day."

"I know you don't want to coop him up all day, but you need to spend time with people. Please don't close yourself off."

"I'm not. I come over to your place last night and I'm going to Will's once he gets off shift tonight. This is only until he's not in the cage anymore. Once that happens, I will go home to let him out and then I will join you guys at Molly's."

"Okay, I'll see you tomorrow. Call me if you need anything."

"Okay, but I won't need anything," Jay answers as he heads to the stairs leading out of the bullpen, leaving Hailey in the bullpen by herself.

Just as she is about to leave herself, she gets a text from Will. Found out earlier today that if Casper is being owner-trained by Jay, Jay does not need a letter of recommendation. As long as Jay has a disability, meaning his PTSD, he can have Casper with him as long as he is in-training or a fully-trained service dog. Reading this text, Hailey feels like a weight is lifted off of her shoulders as that is one less thing that they have to worry about. She texts back a simple reply before heading to Molly's herself.

Arriving at his apartment, Jay takes Casper out for a nice walk to make up for leaving him in a cage all day, minus the few times he was able to sneak away to come home to let Casper out to relieve himself.

When the two make it back, Jay feeds Casper for the last time, before making something for himself. With his belly full, Casper takes his favorite spot by Jay's feet. Jay watches the Hawks game until it is time for the two of them to go to Will's.

Will buzzes the two of them in when Jay texts him to let him know that they are waiting outside.

"Hey, how was work?" he asks his younger brother as he walks in with his dog, trying to start a normal conversation.

"Busy. Barely had time to sneak away to let this guy out," Jay answers while scratching Casper's ear. "What about you?"

"It's Chicago. A lot of traumas came in," Will answers as he turns on the game.

"They were winning when we left."

"So, how has it been going with training him?"

"Okay. I think maybe by the end of next month or so, I can start with the first steps of some of the tasks."

"That's great," Will enthusiastically answers. "Do you know what tasks you are going to be training him for yet?" Will asks, casually trying to bring up the list that Hailey mentioned to him yesterday without his detective brother catching on.

"Yeah, Hailey mentioned yesterday that a good one for me would be using deep-pressure to wake me from nightmares. She told me how to do it and then gave me a list of different tasks that PTSD service dogs are trained to do. She said to look it over and to pick out the ones that would be useful to me and to add any that aren't on the list."

"Okay, so what other tasks did you decide on?"

"I haven't looked at it yet."

"Why not?"

"I," Jay sighs, "I got overwhelmed, so Hailey said to look at it later, and today was busy so I didn't get a chance."

"Do you want to look at it now?" Will notices Jay's hesitation. "It's okay. You're not alone," he comforts.

"Okay," Jay shakily answers, handing Will the list that Hailey gave him.

"Okay," Will states softly, "It looks like there are some repeats with different wording, but this is what she has: retrieving medication, waking the handler from a nightmare, searching the home before the handler to alleviate hypervigilance, tactile intervention when the handler experiences sensory overload, grounding during a flashback, alleviate anxiety/distress and provide psycho-emotional grounding, distract from an event, create space in crowded areas, lead to safety during a panic or anxiety attack, and getting help by alerting another person or activate an emergency button or alert system." Taking a breath Will asks, "What do you think?" Seeing that Jay looks like a deer caught in the headlights, he calls Casper. Casper then starts to bug Jay for attention, effectively snapping him out of it.

"Are you okay? Do you need a break?"

"No, no break."

"Are you okay?"

"Yeah, I think. It's just a lot."

"It is. Do you want to know which ones I think can help you?"

"Sure."

"Waking during nightmares, grounding during flashbacks, intervention with sensory overload, guiding during a dissociative episode, and getting help. Now, the last two I think would just be a precaution. You're my baby brother and the only family I have left. I'm not taking an unnecessary chance that something happens to you. Do these ones sound good to you?"

"Yeah," Jay whispers.

"Hey, what's wrong?" Will asks sensing a change in his brother's mood.

"This is a lot and I don't know why you're still here," he answers, voice not above a whisper.

"This is a lot, but you're not going to go through this alone," Will encourages Jay, the game forgotten. "You've got me, you have Hailey, and now you have Casper. I know I wasn't there for you in the past and I can't change that, but I can change what happens in the future. I'm going to be there for you. I'm not leaving you again. And Hailey, she cares about you so much. It was her that came to me to ask if there was anything she could do to help you. And don't even start me on Casper, you've had him for less than a week and look at how attached he is to you," Will points to the dog, who at some point climb on the couch to be next to Jay, and is now curled up next to him. Not knowing what to say, Jay just leans into his older brother, getting the same comfort from him that he did when they were kids. Will takes this as permission to pull Jay into a tight hug, "I love you, Jay," Will whispers the rare words that for the most part are known but remain unspoken between the two.

"I love you too, Will."

"It's getting late. You two should stay the night, I don't want you driving with everything we just talked about."

"We don't need to," Jay tries arguing.

"That wasn't a suggestion, Jay," Will made known, "I'll get you something you can sleep in, you're going to have to get up a bit earlier to get Casper home, fed and get yourself to work on time, but I'd rather know you're safe."

"Okay, thanks, Will."

"No, problem. If you need anything you can wake me."

"Oh, before I forget. I got an e-mail from Liam this morning reminding me that Casper is due for the next round of his puppy shots next week. Where do you take Kohl?"

"I'll send you that information tomorrow," Will tells him before he makes up the couch for Jay to sleep on. "Goodnight."

"Night."

Jay's sleep is anything but peaceful, tossing and turning, barely staying on the couch.

Casper wakes up when he hears his human whimper in his sleep. Casper tries to lick his face to wake him up but that doesn't work. Not knowing what to do now Casper goes to find the human with the red hair. Finding his way into the bedroom, Casper jumps his front paws up onto the bed. Not able to reach Will, Casper starts crying to try to wake him. After a few minutes, Will begins to stir.

"Casper?" Will sleepily murmurs, reaching out feeling the puppy's head. "What's wrong?" He asks also wondering why Jay hasn't tended to his dog. Before Will has time to try to figure out what is wrong, he hears a scream come from the living room where his baby brother is.

Jumping up, Will is immediately on his feet trying to get to Jay. When he makes his room into the living room, he sees that Jay is obviously caught in a nightmare. "Good boy, Casper," Will praises the dog who was on his heel.

Turning on the lamp to give some light, Will carefully attempts to wake Jay, knowing he might come out fighting. "Jay. Jay, wake up. You're dreaming, Jay." Jay shoots up, gasping for air. "Hey, you're okay. You're safe, in Chicago," Will reminds him while rubbing his back, noting that he has sweated through his shirt.

"Will?" Jay asks confused, "What are you doing here?"

"It's my apartment."

"Did I wake you?" Jay asks before answering himself. "Of course I woke you. I'm sorry, you should go back to sleep. I'm sorry." Jay who is working himself up at this point finds Casper at his side trying to comfort his human.

"It's okay. I don't mind," Will tries to reassure his brother. "Do you want to take a shower? It might make you feel better."

"Okay," Jay answers shakily.

"Towels are in the hall closet."

Walking out of the bathroom five minutes later, Jay is surprised to see that Will was still up, "What are you still doing up? You should have gone back to bed."

"I wanted to make sure you were okay and that you didn't try to leave."

"I'm sorry I woke you."

"It's okay, Jay. You're my brother," Will senses Jay is done talking for now. "Come one, let's go back to bed." Will puts an arm around Jay he guides him to his room.

"What are you doing?" Jay asks when he realizes where Will is taking him.

"Come on, Jay. Like when we were kids," Will tells him, implying he intends to have Jay stay with his the rest of the night.

Embarrassed and feeling like a small child, Jay stumbles, "I, uh, I…"

"Jay, wait. I don't mind. Come on, just like when we were kids and you had nightmares," Will offers.

"We're not kids anymore though," Jay tells him, torn between being an adult and seeking the comfort that he knows he will get from his brother.

"You're still my little brother. And its either this or I sleep out in the living room with you," he informs his brother as he lifts the covers for Jay to climb in. Jay does, not caring that they are both in their thirties. Jay knows that with his brother, his demons won't haunt him, at least for tonight. Jay falls asleep peacefully, with the safety of his brother next to him and Casper on the floor next to him.