Jelsa -ice alliance ?

Arendelle

"AAAAAAAAAAAAUGH!"

Jack's heart leapt into his throat as he fell through the portal, the dizzying tunnel of spinning colors engulfing him as he toppled over and over, completely out of control, the wind shrieking in his ears. Having left his stomach somewhere back in the Workshop, Jack could feel the air being sucked from his lungs in the scream as he tumbled helplessly through the vortex, his hair whipping in his face, until he was launched into the air again, shooting out of the spiral of colors and plummeting downwards through the darkness.

All of a sudden, Jack's shoulder slammed into something hard. The shepherd's crook flew out of his hand and ricocheted across the ice, and he yelped, instinctively throwing his arms out in front of him as he tumbled over and over, helplessly crashing and banging into the ground until his body finally came sliding to a stop.

ShhhhhhhhhhhOONK!

And the spiral of colors collapsed in onto itself above him, the last of the characteristic whooshing sound of the cyclone reverberating through the air as the portal faded.

All was quiet once again.

For a few moments, Jack Frost lay on the ice, gasping for breath. As his eyes adjusted to the darkness, his heart pounding, the stars slowly began to come back into focus, soft and pale specks when compared to the blindly-bright neon colors of the portal.

Ow, Jack thought, shakily beginning to push himself up again. That was just like North. Flinging him here. For snow's sakes, Norway wasn't that far South—if that's where he was. Controlling the wind with his staff, Jack thought, he could have just as easily flown here in a couple hours or so, and OHMYWORDSTAFF!

Jack jolted and sat up, frantically whipping his head around. As it caught his eye, lying precariously close to the edge, he gasped and scrambled across the ice, lunging and slapping his hand on top of the shepherd's crook.

Closing his eyes as he sank back into his knees, Jack Frost slowly let out his breath, protectively pulling the staff towards himself as the dark waves lapped up against the edge of the newly-formed ice floe. Startling slightly, and then rolling his eyes, he turned and looked up.

Jack scoffed.

"Yeah," he chuckled bitterly, glaring at the Moon. "Hilarious."

Getting onto his feet, Jack Frost brushed himself off, looking around in the darkness. Gazing across the dull gleam of the waves, and feeling the movement of the water below the ice, he realized that he was standing in the expanse of a wide fjord. Before him, built on a peninsula stretching forth into the waves, was a sprawling castle. It, and the mountains behind it, was covered with the thick, rich snow of December, sparkling in the moonlight.

"So... this is Arendelle, huh?"

He stepped off the ice floe and walked a few paces towards the castle to get a better look, waves creaking softly as they slowed and froze beneath his feet. Pausing, he glanced back to the Moon again.

"Oh, yeah. I'd definitely noticed," he admitted, "I guess I—I just never thought to investigate."

A few moments passed, and he raised single eyebrow.

"Because it was creepy?" he scoffed. "And, come on. I had a few other things on my plate, too. I didn't realize th—what?"

He stared at the Moon for a few moments. Then, his expression softening, Jack let out his breath, his face cracking into a smile.

"It's good talking to you, too, Manny," he said quietly. "But—uh—I've got a castle to explore."

He turned around and positioned himself to leap off of the ice floe, but then paused, looking up to the Moon. After another moment, he laughed again, a little blood rising to his cheeks as he rolled his eyes.