"Hey, where's Pen?" Derek asked finding Reid in Penelope's bunker.

"She's with Jack in the conference room. She's done for the day so she offered to take Jack off Hotch's hands so he could finish up quicker." Reid explained as he picked up the file he came for.

"Wind the bobbin up, Wind the bobbin up,

Pull, Pull, Clap, Clap, Clap,

Point to the ceiling, Point to the floor

Point to the window, Point to the door

Put your hands on your knee

Now you clap 1, 2, 3.

Wind the bobbin up, Wind the bobbin up,

Pull, Pull, Clap, Clap, Clap," he could hear as he came up the stairs. His heart melted at the sight of Jack sitting on Penelope's lap as she sang. The four year old giggled happily as she guided his hands for the actions.

"Again Aunt Penny." he requested with a delighted squeal. Penelope laughed and started from the top. Hotch joined Morgan at the doorway not long after he got there.

"There is no sound better than that."

"No there isn't. It makes what we do worth it, doesn't it? Knowing that what we're doing is to make sure they're safe." Derek said in agreement.

"Have you talked about that yet?" Hotch asked looking at Jack,

"Not yet, I'm working on the to have and to hold part first."

"Ah, a traditionalist." Hotch teased as Derek grinned.

"Aunt Penny, can we sing the one with the funny words?" Jack asked,

"Of course we can Sugar, are you ready?" She asked the excited little boy on her lap,

"Alouette, gentille Alouette, Alouette je te plumerai

Alouette, gentille Alouette, Alouette je te plumerai

Je te plumerai la tete, Je te plumerai la tete

Et la tte, et la tete, Alouette, Alouette

Alouette, gentille Alouette, Alouette je te plumerai"

"I like that one." Jack said as Pen stopped singing.

"Me too, it's one of my favourites. Hey Jackers, I think your Daddy is ready for you." She said catching Hotch and Morgan at door from the corner of her eye. Jack jumped of her lap, and was running to his Dad when he stopped half way and ran back to Penelope.

"What's up Sugar?" she asked. Jack just grinned and threw his arms around her neck.

"Thank you Aunt Penny."

"You're welcome my little Prince." Penelope said returning his hug. Hand in hand they walked back to Hotch.

"He may be my favourite child in the whole planet." Penelope whispered to Hotch as she handed him back. Hotch gave a hearty laugh thanking her and leading Jack back to his office to pack up.

Penelope habitually ran her hands up and down Derek's back as she stood beside him,

"Hey Baby!" he said turning to kiss her on the forehead.

"Enjoy the show?" she teased knowing he had been standing there a good while before Hotch joined him.

"I sure did. Watching you is my favourite past time."

"Flatterer," she said smiling as she made her way back downstairs to grab her bag.