Elsa's pov

I woke up the next morning, at 3:00 AM mind you, in a cold sweat. I was numb all over and I felt like something was off, I just didn't know what. I got up from my bed. It was still dark, so I could only assume it was my bed. I went to the bathroom to clean up, knowing going back to sleep wasn't an option. When I turned on the light, I nearly screamed. Kristoff's reflection stared back at me through the mirror.

"I, I'm dreaming." I whispered, but in his voice. "I've gotta be dreaming." I slapped myself in the face a few times, but Kristoff's reflection remained in the mirror. "Maybe it's a joke. Yeah, some sort of projection on the glass! And my voice, that I can't explain, but I'm sure it's a prank." I tried to convince myself. I looked down. No shirt, no pants, just some old, worn out boxer shorts. Not my style. "Strike one." I looked at the right arm. Definitely more... toned than my arm is. "Strike two." And the hands were rough and covered in calluses. "Strike three. No joke." I was fairly certain I was in Kristoff's body for real, but then, who was in my body? I had to find out. I dug out a white tee shirt and some brown pants, which felt odd to me because I had never worn them. Then I ran to the room.

When I reached the door, I heard my voice on the other side.

"This is insane! I can't believe this." The door burst open and whoever was in my body yelped. Without thinking, I grabbed them by the shoulders and got real close.

"Who are you and what have you done!? Why are you in my body!?" I demanded.

"Elsa!? It's me, Kristoff!" I let him go. "And I could ask you why you're in my body." He dusted himself off. I guess I never realized how short I was compared to him. The top of my head just barley came up to his chin.

"I don't know why we switched bodies. I don't know who's responsible, I just know that you're me and I'm you." I let the realization sink in. "Which means we're now the opposite genders..." I cringed. So did Kristoff. An awkward silence fell upon us as we let that sink in. Nothing weirder than becoming your sister's boyfriend.

"So, does this mean I have to wear a dress? Because I have outfits from when I was a kid that would fit this body." Kristoff broke the silence. I looked at him incredulously.

"You're kidding. When have you ever seen me dressed like an ice harvester?" I gave him a look.

"Right now, you are an ice harvester." I opened my mouth to protest, but stopped.

"Touché"

"You could say that I was going up to help you and the other harvesters with the ice."

"Alright, fine. But I doubt wardrobe issues are important now. We have to switch back! I have a kingdom to run." Kristoff nodded and suddenly gasped.

"The wedding!" He cried. "It's tomorrow night, and the rehearsal is today!" I gasped.

"And if I look like you, and you like me... oh no." It hit me like a ton of bricks. "I can't marry my own sister! That's disgusting!"

"And I have no clue how to rule a kingdom! There's got to be a way to switch back!" He thought for a moment. "I got it! Maybe if we create enough of a shock, we'll go back to normal."

"Like a collision?" He nodded. He had me stand at one corner, and he stood in the other. The plan was to run straight into each other. Real smart, I know.

"On 3. 1...2...3!" We both broke into a dead sprint. I stopped in the middle of the room, while Kristoff smacked into me. If that had worked, I'd have been in a lot of pain. But I stayed in Kristoff's body, and he stayed in mine, which was probably pretty beat up now. Kristoff got up off the floor.

"Ow. I didn't think that through. Guess I'm the strongest harvester on the ice, but a little short on brains." I was about to make a sarcastic remark when Anna ran in. Boy, was she livid. Her glare could melt Olaf in a second. Then she started screaming at us

"I heard a Thump! What are you doing!? Are you seriously fighting at 4:00 in the morning!?" We froze, and exchanged glances. "Well!?" Anna couldn't know. She would think we'd both lost it. I just hoped Kristoff had the same idea.

"Actually, no." I spoke up nervously. "Elsa" I emphasized my name and shot Kristoff a look. "and I were discussing a trip to the mountains so she could help us ice men with this year's harvest. Right Elsa?" I jabbed Kristoff in the ribs with my...his...with the left elbow. I may have given him a bruise, but he got the message.

"Yep. That's right." Anna didn't look convinced. She walked up to us and sighed.

"Look guys, I just want my soon to be husband and my sister to get along. It's upsetting to see you arguing all the time." She put her hand on my shoulder. I tried not to get tense. "I love both of you. But if you can't go one night without a fight, maybe Kristoff and I should go live in the mountains." My heart stopped. She can't leave me alone here! I just got her back! I had to stop this. I was about to say something, but Kristoff beat me to it.

"Anna, leave the castle? The only home you've ever known? And what about El-" He almost let my name slip, fortunately he stopped and corrected himself. "-len! Ellen would miss you a lot." Ellen was our head chef, and Arendelle's finest baker. Nice save. Anna shook her head.

"I'm sorry Elsa. But maybe it's for the best anyway. You two have conflicting personalities, and if Kristoff and I decided to raise a family, well, I wouldn't want my kids to grow up around constant conflicts." I was really starting to sweat. What if we didn't switch back before the wedding? What if this was permanent!? I'd either have to marry my sister, or break her heart and make her think I'm insane! I'm not a big fan of upsetting Anna. And kids!? The very thought made my stomach lurch. I finally spoke up, fighting back the sick feeling.

"I think we should stay at the castle Anna. I promise Elsa and I can learn to, at the very least, tolerate each other." I went over to Kristoff and patted his shoulder. Or my shoulder. This is so confusing! We both threw on our most convincing smiles.

"We'll be good friends in no time." Kristoff agreed. Anna was still skeptical, but she shrugged.

"Alright then, if you can get along these next two days, we'll stay in the castle. Now I think I'll go back to bed. Goodnight." She yawned. Then she approached me, and I didn't like the look in her eyes. My fears were confirmed as soon as she shut her eyes and puckered her lips. Having no intention of kissing my sister, I stepped back, letting out a small gasp. Her eyes popped open and she looked confused. "What's the matter Kris? You've never backed away from a goodnight kiss before. Is something wrong?" 'YES!' I mentally screamed. I looked at Kristoff for help. He was as scared as I was. I was on my own.

"Uhh, well, I-I know how uncomfortable... I-er... Elsa gets when we get... super...Uhh... affectionate around her." I decided to be honest, but even then, I was as nervous as a mouse at a cat convention. "And you did say we should be better friends, so I thought it would be...umm... respectful to... not..Uhh, oh boy... kiss... you... in front of... Her?" 'Or not kiss you at all.' I didn't sound convincing. Kristoff and Anna stared at me, then my sister shrugged. Without a word, she pulled me out of the room. I looked to Kristoff for help again, but he was lost in thought. Great.

Once we were outside the room, Anna sighed and smiled. Before I could react, she kissed my cheek. I fought the urge to shudder. 'She thinks you're her fiance. She thinks you're Kristoff. You're in Kristoff's body. Act like it!' I had to remind myself. I wanted to panic, but I just faked a smile.

"I'm glad you're making an effort to be friends with Elsa." Anna said. "And I'm happy to know you care about her feelings. That means a lot. Thank you." She then turned and walked back to her room.

"No problem." I whispered. What had I gotten myself into?