On the branch of a big tree in the local park, Jack Frost sat. It was spring, almost Easter - a year had passed since he became a guardian. Jack couldn't help but feel down. He couldn't feel the warmth, or cold for that matter. Without knowing exactly what caused him to feel so sad, he watched as the cold from his body created icy patterns over the tree.
"Jack?" He heard a boy yell. It was Jamie; the only person he actually felt okay being with. "Move over a little." Jack moved to allow Jamie to sit beside him. His body had left a frozen trace, but the kid didn't mind it.
They sat in silence for a while. It didn't bother Jack, lately he had found that his favorite times were when he didn't have to speak as he wouldn't ruin anything if he just kept quiet. Instead of flying around and creating snow storms or freezing the city, he'd rather just quietly sit in that very tree, protected by the surrounding branches and leaves, watching the thin ice left on the lake slowly melt away.
"How have you been?" Jamie asked. "You've gotten worse, Jack." The spirit of winter didn't answer for a good thirty seconds.
"I don't know."
"What do you mean?"
"I don't know why I'm like this."
"Well... at least try to describe your feelings?" The kid said. Jack looked into his warm, brown eyes. They reminded him of his little sister. He couldn't remember her name, but he remembered her face clearly.
"...Remember that time I told you that the sun wouldn't disappear just because only the moon was visible?" He asked Jamie in a hushed voice. It was quite hoarse, he hadn't spoken in quite a while after all.
"Yeah?" Jamie said.
"I feel like the sun has disappeared."

Jamie clutched the glass ball filled with glitter that North had left with him in case of emergencies. He was a little scared, but he had to speak to the guardians about Jack. Jamie threw the ball into the floor, causing the portal to open in front of him. He took a deep breath and threw himself into North's domain.
"Jamie?" North asked with a surprised face.
"Please bring the others here. Except for Jack." Jamie said and looked into the man's eyes. A worried look grew in North's face.

"I really hope this is important," said an irritated Aster. "I still have a few thousand eggs to paint before Easter."
"I wanted to wait until all of you were here," Jamie said. "I think something's happened to Jack."
"Isn't something always happening with that brat around?" Aster asked, with a bored look on his face and a raised brow.
"Please listen," the kid said and stared at the Easter bunny. "He's gotten worse. I think he's depressed."

Jack flew high above the city. The wind blew away his tears - that transformed into crystals of ice before disappearing into the clouds. Jack thought about all the things he had done, flying. A little smile grew on his face when he remembered all the times he had pulled pranks on people. They were always so funny to... watch. He couldn't interact with them. Not even now, only Jamie and his friends believed in him and that was far too little for everyone to see him. The smile faded. However, Jack didn't feel that not being seen was what really caused him to feel like that. Rather, he almost wished that nobody would believe in him at all, because then the man in the moon might take him back. Where "back" was, he didn't know - but at least withdraw him from the humans' world.
Suddenly a vision made him blind for a brief moment. He saw Jamie and the other guardians in North's palace, all with worried looks on their faces. Without another thought he changed the direction he was flying in, and headed for the north pole.