A/N: Here's a one shot for you Finnlee shippers! Hope you enjoy and please review. (Edit: I decided to try to add in some detail and such to make this not as terrible lol)

The Truth Changes Things

So I have a secret, well it's actually a longer story. But I doubt you all want to hear me babble on, so I'll make it short and sweet. 3 months ago, Princess Bubblegum was able to create an invention that gave us the opportunity to get access to other universes. She believed this invention was too powerful to keep lying around so she entrusted me with it. That was such a wise decision.

Given such a powerful creation, I did what anyone else would have done; I decided to try it out. I honestly can't remember what it looks like while I'm traveling but for some odd reason I always stop at the same universe. There's only one difference between our two worlds. Every ones Genders are swapped so yes, I turn into a girl. I go by Fionna, and I fit in pretty well. No one suspects a thing.

Well here's the big secret; I fell in love. No not in love with Princess Bubblegum or Flame Princess gender bend person. But with Marceline's.

Marshall Lee is his name and just saying his name out loud makes me want to giggle and hug myself. Girls are strange, aren't they?

Does that make me gay for liking another male? But I am a girl so does it count? I don't understand, my feelings for Marceline are mutual. She's a good friend, so then, why does my heart quicken when I think of him?

I'm tempted right now to use the device to go back but I already went there today. After PB found out about me using her invention, she explained to me that using it more than once a day could over heat it and trap you in that dimension forever. I'd be fine with that. Just knowing that fact makes me want to push the red button, why shouldn't I? The Land of Aaa is so much more peaceful, you don't see the Lich trying to take over their world.

*BEEP!*

Oops, I pressed the button. Now I'm leaving the Land of Ooo, probably for the last time. I can't even say goodbye to Jake. I will definitely miss him.

The machine shook and shocked me before sucking me up, sending me at light's speed to Aaa. I sat up and looked around, my head felt a bit dizzy.

"You alright, Babycakes? You fainted a bit ago." Cake asked, her expression full of worry.

I smiled, "Yeah. Sorry for worrying you," I apologized. I stood up from my bed and carefully made my way downstairs with my older cat sister following behind.

"Marshall left a basket of strawberries for you. It was he who found you unconscious in the woods, carried you all the way back." Cake explained grabbing one of those strawberries, taking a bite.

I blushed, "He seriously carried me? You're not lying, are you?"

She nodded, "Even wanted to stay to watch over you to make sure you were okay but I told him no." She giggled, "That boy cares a lot about you, seems like you have a crush." She explained, grinning as my face grew redder by the second.

I had to bite back the happy grin that threatened to show and grabbed my backpack, "I guess I'll go thank him." Turning around, I was stopped at the door.

"But aren't you hungry Fionna?" Cake called, biting into another strawberry.

I turned and smiled, "I'll eat at his place. See you later, Cake." I called before leaving the tree house I've always lived in.

So this was the routine. I'd arrive, go to Marshall's, go back to the tree house and play with Cake and B-MO. Then I'd go back to my world. Would my routine repeat itself once more or would it just stop, never repeating the last step ever again?

Earlier today I had to leave quickly because I promised PB I'd help her with a slumber party and completely forgotten about it. Apparently leaving this world knocks you unconscious, but how did Marshall find me? Was he following me?

Did he see me... use Bubblegum's device? Does he know I've been lying to him since day one? Maybe I should just tell him, but will he hate me? I shook my head and continued running, I'll figure out what I'll do after I arrive.

About 20 minutes later, the large cave appeared and I stopped to catch my breath.

Weight added to your chest and butt can really slow you down! My first experience with my lady parts is untellable but I can tell you I've never been so embarrassed in my life. It took about a week before I could finally bathe without freaking out.

I lightly tapped on the door, a few seconds later, Marshall answered only in his boxers. I blushed and looked away, "Um hey..." I mumbled, my eyes finding their way to the ground, refusing to look back up at the ravenette.

Marshall noticed my embarrassed state and realized why, leaving quickly to change while I waited in the living room. Soon he came back down, now fully dressed. "Sorry about that, what's up?" He asked as he floated beside me.

I kicked some invisible dirt, "I just came to give thanks for helping me." Giving a shrug, my eyes slowly lifted and met with his crimson orbs. Biting my lip, I slipped passed him and headed straight for his hard couch.

He shrugged, "No problem Fi. That's what friend's do for each other, you did have me worried. It seemed like you were dead," he gave a nervous chuckle as he rubbed the back of his neck

I sat down and got as comfortable as I could on this sad excuse for furniture.

He laughed, "Anything else? Or did you just come to sit on my couch?" He joked, a smile stretching on his pale lips.

My thoughts went back to the secret I had, I guess I should just tell him. What's the worst that can happen? I don't think he'd get angry or anything, just quit talking to me. That didn't seem too appealing either though. "So, um..." I started. "I have to tell you a secret... but, you may not like it..."

He laughed and playfully pushed me, "Why are you acting so serious?"

I took off my backpack and unzipped it. Opening it, I pulled out the transporting device. It seemed alright so it most likely didn't over heat. Well at least I can go back to my world and sulk.

"What is that?" Marshall asked confused.

I smiled, "It's something that gave me the chance to meet you." I felt something in my chest build making it hard to breathe, tears pricked at the corner of my eyes.

Marshall grabbed my arm worried, "It's alright Fionna, you don't have to tell me."

I shook my head; I had to get it off my chest. "I'm not actually from here. I'm from another universe, my real name is Finn and I'm a boy. B-but when I first saw you, it was love at first sight. I'm sorry..." I apologized, feeling like I had done the worst thing possible. I felt like I betrayed him.

He wrapped his arms around me and hugged my sobbing body while shushing me.

"Aren't you mad at me? I've been lying to you the entire time." I asked trying to wipe the tears from my face myself.

"Why would I be mad at you? The Fionna I know is the one I enjoy having around, I don't care what or who you are. It's your personality I love."

I blushed, "You enjoy having me around?" I noticed a pink tint to his cheeks.

"Of course I do, you're my bro dude." He smirked, giving my shoulder a nudge.

I smiled, "Well I better go." I said sadly, "My world is probably missing me." I handed him the device, "Hold this and don't let go."

"You're leaving me already?" He frowned, "But you just got here!" He pursed his lips, "Let's play videogames, I still have to kick your butt, remember?"

I wiped my eyes, shaking my head before pushing the button, "See you later." Though I knew that what I said wasn't the truth.

"Fionna!" Marshall yelled before a light engulfed me, my girlish body fainted just as usual.

I gave the device to Marshall so now it was no longer in my possession. This was a one way trip, no more Aaa. I've had my fun, heard what I had to hear. I was able to tell Marshall the truth. That's all I wanted, that would have been my biggest regret if he hadn't have known. The outline of Marshall's face vanished and not even a second later, I was on my bed. Sighing, I laid back. I was Finn again.

A month has passed since I've traveled to Aaa, I've busied myself with adventures with Jake. I've noticed something very odd though... Recently the way Marceline looks at me is kind of weird. Makes my heart beat faster.

A/N: Well hope you enjoyed lol so wait is this a finnlee or a fiolee shipping? Review please!