"Elsa! Jack! You're okay!" Olaf cried as Jack and Elsa landed on Frostlorn's deck.

"Why wouldn't we?" Elsa asked as she kneeled by the weeping snowman.

"Because your boat came back to our boat, but you weren't in it and all your supplies were gone! We had no idea what happened to you, but I'm so happy to see you both okay." He hugged both of them as best he could with his twig arms. "Now we can go home."

"Yes, but first we have to bring Jack back to his home in the colonies."

"Oh, right. What are we waiting for? Let's go!"

And so they went, sailing west until they docked along the Pennsylvania coastline. Elsa snuck out of the ship and followed Jack through the dense forest to the moonlit lake that rippled quietly in the late summer night.

"So this is your home," Elsa said as they watched lily pads float along the water.

"I guess you can call it that. I know there's not much to it, but eh, what can you do?" he said with his usual grin.

"It's lovely," she said, but her smile fell. It was time to finally tell him what Umbra told her. "Look, Jack, Umbra told me that when she lived on the moon, she was the one that gave me my powers."

"Whoa, really?"

"Yes, and since your powers come from the Man in the Moon, maybe that's why I could see you even though I had never heard of a Jack Frost before."

"I thought you could see me because you had ice powers, but I guess your theory makes more sense. Did Umbra tell you why she gave you your powers?"

"Because the Man in the Moon created you and she wanted to out-do him."

"No word on why he created me in the first place?"

"No."

He crossed his arms and pouted. Elsa debated herself on whether or not she should tell Jack that he was once alive. She understood his frustration at not knowing why he was what he was, as she had been frustrated with those similar thoughts. However, now that Elsa knew the awful truth about the origins of her powers, she wondered if she was better off not knowing in the first place. She also didn't know the whole story behind Jack's creation. It would be better, perhaps, to wait and find the whole truth before telling it to him. She stepped onto the pond, its surfacing freezing beneath her feet. Elsa pointed to the moon and said, "Since our powers came from the moon, that makes us brother and sister in a way, wouldn't you say?"

He stared at her for a moment before joining her on the ice.

"I don't know," he said, folding his arms behind his head. "I never had a sister before, but I wouldn't mind having one."

"I never had a brother before either and I wouldn't mind having one, and I don't think Anna would mind either."

"Yeesh, two sisters at once? I don't know if I can handle that, but I'll try," he said with a grin.

"Good. You promise to visit us soon?"

"Of course, especially now that I know my way around the world a little better. Thanks for taking me back home."

"You're welcome," Elsa said, a hot lump growing in her throat. "Good bye, Jack."

They hugged for a long moment.

"I'll be seeing you again soon, Elsa," he said softly as they let go of each other.

He hitched a ride on a cool wind and disappeared into the night.

After a two-month long voyage back across the Atlantic Ocean, the ship returned to Arendelle safe and sound. Elsa, Olaf, and the ship's crew were greeted with trumpets, confetti, and cheering citizens who bordered the main road back to the castle.

"Home sweet home," Olaf said as he waved to his fans.

"You can say that again," Elsa said, also waving as she rode the white horse provided for her by one of the royal guard.

"Home sweet—"

"ELSA!" Anna shouted over the crowds.

Anna rode her horse as quick as she could to Elsa, her hair ribbons flying off into the street. Riding side-by-side, Anna threw her arms around Elsa and hugged her as tight as she could.

"Elsa, you're back! Were you able to find the ice castle? Where's Jack?"

Anna let go of her sister and Elsa had to take a few breaths before she could answer.

"And a lot more, but I'll explain it all once we're inside. It's good to see you again, Anna," she said before hugging her sister just as tightly.

Once Elsa had explained to Anna and Kristoff all that had happened, they put extra guards to be on alert for raging magical queens from the moon. As the months passed, however, there was no sight of the queen or of Jack. Hopefully this meant that the queen was still frozen at the bottom of the ocean and that Jack was still safe. Hopefully.

Elsa found herself once again trekking up the mountainside to be alone in her ice castle, something she hadn't done since she and Jack left to look for Umbra's castle.

As she approached the front doors, she heard a faint "Woop!" and "Whee!" She blew the doors open and watched Jack Frost slide down the banister on the soles of his bare feet, fly off it, and skid to a stop in front of her.

"Hello Elsa," he laughed, "I was hoping to find you here, and I did!"

Elsa folded her arms and scowled. "Get lost again?"

He scratched the back of his head and laughed again, only much more nervously. "Yes. A lot. I did just find your castle, though, and was going to go to Arendelle."

"It took you long enough," she said and hugged him.

He hugged her back and they both laughed as he twirled her in the air. It was good to have her brother back, and Elsa would make sure that he stayed in Arendelle a lot longer this time.

AN: Thanks again so much for reading! There are actually going to be two more books after this, one that I'm planning to give her on Valentine's Day and the third I'm planning on for her birthday in April. Fun fact: I don't like Frozen (though I do like Guardians), the girl-child does not believe me, and so she asked me to write her a story where Jack and Elsa are brother and sister, because she firmly believes that they're siblings, so I thought it'd be fun to toy with the definition of brother and sister a bit, and I had a lot more fun writing this then I thought I would.