Fun:

noun

1. A source of enjoyment, amusement, or pleasure.

2. Playful, often noisy, activity.

3. Lively, joyous play or playfulness.

"Thanks Castle," Kate spoke unexpectedly as they walked through Central Park.

"For what, detective?" he questioned, looking into her beautiful green eyes.

"I don't think I could have solved this one without you."

"You're welcome," he replied, but not in his usual famous author tone. This was the real Castle. He looked around at the orange landscape. "You know what I love about the Fall?"

"Hmm?" Kate failed to notice her partner edging closer to the grass.

"Leave fights!" Rick yelled and in one smooth motion bent to the ground and scooped up a handful of autumn leaves, throwing them at his favorite detective.

She let out a little, very uncharacteristic squeal. "Castle!" She shook the orange foliage out of her hair. "Oh, this means war," she laughed.

"Give it your best shot," he returned with a 'come on' motion.

They continued to banter back and forth, throwing and dodging, laughing and squealing. "I surrender!" Kate threw her hands and her last bundle of leaves in the air, falling back into the sea of orange. The leaves falling all around her.

"Victory is mine!" Castle cheered, plopping down next to the detective.

"That was fun," she rolled onto her side, a smiled plastered of her face. "Thanks."