Disclaimer: I do not own CSI: NY or Criminal Minds. They belong to their own groupies.

Summary: Don is visiting his nephew when Aaron gets called out on a case. What does uncle and nephew do on a hot summer day?

Don Flack always enjoyed the summer months. Well, most of the time – in the city, everyone tended to get a bit crazier when the temperature goes up. But, for the next two weeks, he was not going to worry about any of that. He was spending the next two weeks with his nephew while his brother worried about his job without having to worry about his son. "Alright, Jack, how about we go to the pool?" he asked as the four-year-old finished up his breakfast. Aaron had already left for work, leaving the two to fend for themselves.

The little boy's face practically lit up as he asked excitedly, "Can we?"

"May we," Don corrected, "and yes, we may. Your father is going to be working late, so we have the whole day to ourselves. So go get ready to leave." He smiled as he watched his nephew literally threw himself from the chair and ran to his room. He finished washing the dishes; but before he could get ready himself, his phone rang. "Flack," he responded as he normally did.

"You're on vacation," said Aaron.

"Yeah, well, old habits die hard," retorted Don as he entered his bedroom.

"So what are you guys doing today?"

"We're off to the pool."

"Sounds like fun." Aaron said forlornly.

Don sighed. He just knew that his older brother was going to spring something on him. "Okay, spill it. You have that tone of voice that tells me that something's up," he ordered.

It was then Aaron's turn to sigh. "We have a case in Honolulu where there is a possibility of finding the victims alive. We're leaving in an hour," he explained.

"And you want me to watch Jack for a few days? No problem. Just find those people," he reassured as his nephew came into his bedroom. "Here, talk to Jack for a moment while I change into my suit," he said as he handed the phone to Jack. As the little boy excitedly told his father about his upcoming adventure, Don quickly changed into blue-and-white striped trunks and a white polo shirt.

He walked out of the bathroom to hear Jack say, "I love you, Daddy. See you soon!" He then handed his phone back to his uncle and walk out of the room, Don right behind him.

"You leaving?" he asked Aaron.

"The plane's ready. I'll see you in a couple of days."

"Good luck," said Don as he hung up the phone. He then looked down at his nephew and said, "Looks like it's just you and me for the next couple days, little man."

"We still going swimming, Uncle Donnie?" asked Jack.

Don just groaned. He hated it when Jack called him that. Aaron got Jack into calling him that. Aaron thought it was funny; but Don just did not like it. "Yeah, we are, little man. You ready?" he asked.

"Yep!" came the answer. Don grabbed a cooler and put in some water bottles and deli sandwiches. He and his nephew then left the apartment and left for their day of fun.

"Uncle Donnie!" squealed Jack as Don picked him up and pulled him gently back into the water with him. They have been at the pool for a couple of hours, and Don can tell that the little boy was getting tired.

"Alright, little man, time to get out," said Don. Seeing his nephew's sad expression, he said, "We may come back tomorrow. But right now, we need to get out and into some shade before the heat really gets to us." Jack nodded and let Don pull him out. They both dried off and left the pool area. Don drove them to a small park and they ate their lunch.

"When is Daddy coming back?" asked Jack as he ate his sandwich.

"A couple of days. He'll be back," he assured the little boy. Don knew that Jack tended to have a hard time with Aaron having to travel; but Jessica told him that it was getting a bit easier, especially since Aaron called him every night. So he should be expecting a call tonight. "So, you enjoying your summer?" he asked.

"Yep! But I am ready for preschool," Jack said. "I want to learn new things; and maybe someday I will be able to help you and Daddy."

Don smiled. "I have no doubt about that, little man. But what do you say we head inside and get cooled off?" he asked. The little boy nodded earnestly and Don led him back to the car.

It was a really hot summer day. Hotter than Don had ever experienced. Okay, summer is suppose to be hot, but not this hot, he thought. He was now happy that he made the right decision on getting them inside. He did not want to explain to Aaron why Jack was in the hospital.

Right now, they were eating chocolate ice cream while watching Toy Story 2. Jack absolutely adore Woody and had proudly proclaimed that he wanted a Woody toy. "We'll see. Just keep up with your chores," said Don. After the movie was over, Don got Jack ready for bed when the phone rang. Seeing that it was Aaron, he answered with, "Hey! How's Hawaii? Is it as hot as it is here?"

"Not too bad. How are you guys doing?" asked Aaron.

"You worried about us, big brother?"

"I know you."

All Don could do was laugh. "We're doing fine. We went swimming and had a small picnic in the park. Then we spent the evening watching Toy Story 2 and eating ice cream. Oh, and you owe him a Woody doll," he told him.

"Thanks a lot," muttered Aaron.

"Anytime," said Don. Feeling a tug on his pants, he looked down to see his brown-eyed nephew staring up at him. "Hold on. Someone wants to talk to you," he said before handing the phone to Jack.

"Hi, Daddy! It was a really hot day today," Jack said as he rambled on about his day. Don proceeded to wander off to finish locking up before he put Jack to bed.

He let Jack talk to his father for a half hour before the little boy handed the phone back to him. "You're good with kids," said Aaron.

"I love kids, it's just the women that have a problem with me," amended Don. "The case going well?"

"Not as well as we hoped. But we have a lead that Morgan is working on."

"He'll find something."

"No doubt there. Well, get some sleep, 'cause Jack may be a handful tomorrow," recommended Aaron, a hint of mischief evident in his voice.

Don frowned. "What did you do?" he demanded.

"You'll find out tomorrow," replied his older brother. "Goodnight."

"Goodnight," repeated Don as he hung up. Why did he have a feeling that tomorrow was going to be trouble?