Disclaimer: All Adventure Time characters and names and places are licensed creations and property of their creator, Pendleton Ward. Along with the

Author's Note: This is a 3 part story that takes place in an alternate universe. No More No Less.

Tags: Love Triangle, Drama

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Part 2: Part Time Boyfriend

Monday

City of Gumbald, Mertens Flat

(Present)

Coming back to the present after having reminisced about the time she was saved by and met Finn Mertens. Marceline let out a deep sigh and jumped out of her couch to get the day started. Each day started the same, but ended a little differently. It started out with cleaning the living room first. That meant sweeping first and then mopping secondly. Thirdly, was dusting the couch and sofa couch. Fourth, was cleaning the windows. Afterwards, was cleaning the kitchen which would get the sweeping and mopping treatment also. If there were any spare pots and pans and plates that were left out, uncleaned from yesterday. Marceline would clean them. After the kitchen and livingroom, came the bathroom. Then the closets and cleaning the hallway.

The last two places to clean were Nightbolt and Darcy's bedrooms. 'Nightbolt' was the name of Marceline and Finn's son and first child. The name came from the night he was born in and with a sudden lightning bolt that preceded his birth, which was unusual since no thunder or boom was heard to accompany the lightning bolt. There were no signs of a coming storm afterwards either. Darcy's birth was in the evening, turning to night. The meaning behind her ancient name meant, 'Descendant of The Dark One.' Which was perfectly suitable given who her mother was, and the line of demonic/vampires she descended from. Walking inside of her son's room first to start cleaning. Marcy thought back to the start of her infidelity.

"It was three weeks after I met and kissed Finn Mertens."

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Three Weeks Later

(Flashback)

"My day started off as it usually did. Well, actually that's a lie. I started off the day unusually cheerful and charismatic for Bonnibell. I was the first to wake up. I washed myself. Clothed myself and got right to making Bonnibell breakfast in bed. I knew she would ask me what the special occasion was or what I was hiding. But all I could tell her, when I brought the little table over for her, was that it was a thank you gift for 'going out with me to see Finn.' She bought it. And I felt horrible about it. But it wasn't a total lie. I did feel like doing something nice for her, well something nicer for a day. But it was meant to soften her guard so she could go about her day with as little worry or concern for me as possible. I didn't want her building up suspicions about me. Long after Bonnibell left for work. I gave Finn a call, and asked him to come over. Within thirty minutes, he was already standing outside of my apartment front door. Before I could invite him in, I made an oath to myself that I would go through with this to the very end, wherever this might end up taking me. I opened the door and invited him inside.

Finn's behavior was not as I expected it to be. In fact, it was the opposite. When he stepped inside, he stopped just far enough in to give me space to close the door behind him. I don't know why. But I distinctively remembered my hallway being darker that time, with the light shining through from the main area of the apartment. The only light that made it onto Finn's face. I remembered the glints that reflected off his eyes. They were hauntingly attractive.

"Is this really a good idea, Marceline? To be honest I feel like I'm intruding into yours and Bonnibell's life. I know this is infidelity and I know you know too. But if I continue now, and walk into the rest of your apartment. Then I can't cross back over this line. So, what do you want to do."

I locked the door and took a hold of both of Finn's wrists and pushed him against the wall by the door. Pressing my chest against his. I locked fingers with him and stared into his eyes in the dark. I can see just as fine in the dark as I can in light. And i pressed my lips against the side of his neck and took in his scent. Pressing soft kisses along his beautiful neck. I traced my lips over across his face till they met his own. Locking lips and kissing deeply and fervently. Finn pushed me till I had my own back against the wall across the one I had him pinned against. Finn was so intrigued with my tongue. Flicking it while it was inside of his mouth. Pulling away, I told him.

"I've fallen in love with you Finn. If you had been only a few inches away from me, I'd be thanking you after you were finished being buried six feet under. And kissing the head of your tombstone instead of your warm lips right now. But I'm happy your alive. I'm happy you saved my life."

"But what about Bonnibell? Doesn't it...hurt you to know your doing this behind her back? I know I would be hurt if I were her."

"It does. I know it's wrong. But my love for you, that can't be wrong can it? Can it Finn?"

"No Marceline. I think I could fall in love with you too, just as hard as you did for me."

And from that point on, Finn and I have embarked on this forbidden secret relationship. While being a full time girlfriend to Bubblegum. Finn was my part time boyfriend."

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Montage

For the first day to the start of their secret affair. Marceline and Finn simply relaxed back on her couch and watched movies and talked. The list of movies watched by them varied from comedy to horror and adventure. After popcorn and bottles of pop. Finn left Marceline, but not before Marceline could pull him back in for a deep kiss. Their second date took place again on one of Marceline's day off from her part time job. And this time it took place outside. Taking Marceline to a location he frequented a lot on his days off from work. Finn took Marceline to an Arcade with a hundred different selections of games to play from. Adults and teenagers made up the majority of the patrons of the arcade joint. After blasting through zombies and slashing through skeletons.

Finn took Marceline, by the hand, and lead her to a sweets shop. Marceline was never a fan of sweets in the beginning of her life. Not that she despised it, but it just wasn't her first go to choice when it came to eating something. That was all in the past. But since getting with Bonnibell and living with her for so long. Naturally, Marceline took a liking to her scent and the smell of sweets. And so picked out a handful of sweets, which Finn paid for. A week later, Finn took Marceline out to see a new movie at a movie theater. It was a Horror/thriller that was about about inter-dementional pigs bringing in a deadly fog into a small city. The survivors of this 'Pig plague' gather and hold themselves up in a military base before pushing forward, in an effort to find where the fog and pig based terror ended.

Having thoroughly enjoyed the movie. Finn and Marceline found themselves in a bit of their own heart pounding and terrifying adventure. Having finished leaving the theater and heading to their next location. Marceline spotted her girlfriend, Bonnibell, waiting across on the other side of the street that she and Finn were going to take. Pulling Finn by his hand in an attempt to evade Bubblegum who, when she looked at both ends of her street to make sure it was safe to cross. Spotted Marceline and someone else with her, make a sharp quick turn behind a street corner. It was Bubblegum's lunch break and she always liked having them outside. So spotting Marceline outside with who she thought was another person, trailing behind her, raised red flags for her. To learn if Marceline was cheating behind her back. Bubblegum called her every hour while she was away at work. Counting how many times Marceline failed to call her back or text her.

When Bubblegum finally got a reply back from Marceline, which was at the end of her work day. Bubblegum was given a plethora of answers to each of her questions. The answer to why Marceline failed to call or text her back when Bubblegum tried contacting her. Marceline said she was either busy with work. Using the bathroom. Forgot to take her phone with her or her phone was just dead, and forgot to charge it. Bubblegum let Marceline know that she never had this problem before. To which Marceline could say or do nothing but shrug her shoulders in confusion. It was the not the type of response Bubblegum had been hoping for or was used to from her girlfriend. It was not the Marceline she knew.

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Three months Later

"Three months into my secret love affair with Finn Mertens, and evading questions from Bonnibell about whether or not I was cheating on her. Finn took me to perhaps the strangest and last place on his list of places, that he wanted to take me. But it was also the last nut that screwed on my love for Finn. The place Finn took me to was an airstrip that was just outside of the city. I was blindfolded the moment we got into his car from his house, and remained the way until we reached the airstrip. Helping me out of his car. Finn pulled the blindfold off of me, and showed me an old fighter aircraft plane that was prepped and read to take off. All that were missing was it's pilot, Finn. And a passenger, me.

Finn had already placed a ladder for me to climb up on to get to my seat. Climbing up right after I was firmly in my seat. Finn buckled my seat-belt and made sure I was safe and secured. I grabbed the tip of his chin with my hand, and pulled him in for a kiss. It was hard to believe that for as long as I have been with Finn, never once had we done it. Worried that he might be wary about having sex with a hybrid, such as myself, and being able to change my sex. I assured him as I was as woman as womanly possible. But that was not his issue. His real issue I would learn afterwards. Finn started up the old fighter aircraft. Closed the bullet proof plastic window overhead, sealed it and took us both flying.

Sadly and regrettably at the same time as Finn had taken me flying. I would learn later on, that Bonnibell got off of work and called me and left me a text message, for good measure. That when she got home. She wanted to prepare us a romantic dinner. And that hopefully by the end of the night, I would explain to her everything that was happening with me, and why I was being so secretive and disconnected with her and our relationship."

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Hours pass

Long after Finn finished taking Marceline flying, and making her laugh and squeal in terror by performing barrel rolls and loop-d-loops. Finn drove Marceline back home. By this point Marceline knew that the moment Finn's car would drive up beside the entrance of their apartment building, Bubblegum would be watching from the front entrance camera channel that all tenants had access to on their televisions. Before stepping out, Finn saw it best to step out of his seat and open the door for Marceline who rewarded his action with a deep but short kiss. Waving goodbye to Finn as he drove away. Marceline turned and headed back inside of her apartment building, to confront Bubblegum.

Expecting to feel stronger and confident after having spent so much time with Finn. Marceline thought she would be able to face and tell Marceline the honest truth about their situation, and her being the cause of it. Stopping in front of her apartment door, key in hand and shaking from the heartache that waited for her when she stepped through her door. Marceline swallowed her anxiety and unlocked her door. The lights were dimmed. With the only set of bright lights being the two melted candles that were set up on their dinner table, in front of deliciously prepared meals that by this time had already gone cold.

Bonnibell Bubblegum was sitting on her couch, wearing a black dress with one leg crossed over the other. Marceline found the light switch for the whole apartent and brightened the apartment. "I expected her to be angry and furious and disappointed. But when I saw her eyes moving to meet mine. All I saw were eyes filled with tears. Filled with so much pain and loss. And it was all caused by me."

"Why Marceline. Why would you. HOW COULD YOU!?' Bubblegum yelled at Marceline.

"She required an answer, an honest answer. And I was going to deliver. Bubblegum. Bonnibell, it wasn't anything you did. Finn Mertens. It was Finn who did something to me."

"Did you fuck him!?" Bubblegum snapped at Marceline.

"No. We haven't even gotten that far if you can believe it. When I mean that Finn 'did something to me.' It was more than just his act of heroism. It was what I felt from deep within me that made me fall in love with him."

"So what happens to us then, Marceline? How exactly is tomorrow going to start for us? Am I going to wake up to find you gone."

"I love you Bonnibell. Loved you more than anyone that would have come along, into your long life. But now there's this rift between us."

"Yeah, and his name is Finn! There was never a rift between us before he got involved." Bubblegum said.

"You mean before he saved my life, Bonnibell. Had he not gotten involved, I wouldn't be here anymore. I don't know how to proceed from this point on Bubblegum."

"You mean, you don't know how to break up with me, is what your trying to say. Well let me give you a helping hand Marceline. All of your shit, I packed up already. Your suitcase is in the kitchen. Take it and leave. Go and never come back!"

"I did as Bubblegum asked of me. I grabbed my roller suitcase from the kitchen and walked out of her apartment. I called Finn and told him what happened, and asked him if he could pick me up. I told him I would be waiting outside of the building. On my descent down to the lobby in the elevator. When i stepped out of the elevator, and started to walk out of the lobby. Bubblegum surprised me by coming running out of the second elevator just moments after I did.

Grabbing and pulling me back around by my shoulders, to face her. Bonnibell laid the deepest kiss on me I had ever felt up to that moment in my very long life. I loved her then, and I still love her now. Was I wrong for falling in love with Finn, my savior? No. Was it wrong to walk out on Bonnibell in favor of getting with Finn? Yes. You can see the kind of a problem I gotten myself into. After nearly suffocating to death from our deep kiss. Bubblegum whispered into my ear and told me something. Then promptly turned back around and headed back up to her apartment. I walked out of the lobby when Finn finally pulled up. Helping me with my suitcase first. He held me and hugged me. Something I needed at the moment. Finn took me home with him that night.

Finn gave me two years to get accustomed to my new life living with him. And to also 'forget' about Bubblegum. Something I still haven't been able to till this day. Because we were of different species. We thought a family would be impossible. But after talking to my mother and father. We learned that we could make a child, with the aid of a ritual on a certain night when there was either a full moon or blood moon out. At 23, Finn and I made love first, then fucked like animals the whole night of a full moon. The morning after, I learned I was pregnant with our first child. A boy who had his father's spirit and heart, but had my physical traits. A year later again, we had out second child. This time a girl. Who looked as human as Finn did, yet had my spirit and heart. For a time while raising my babies. I had completely forgotten about Bonnibell. Yet each time I wondered what our own child would have been like, had it survived to term; I was brought back to tears thinking about it. When Finn turned 25, we finally got married.

For his birthday gift last year, when he was 27. My father gave Finn a once in a lifetime gift. The elixir of youth. A drink that would keep him young and handsome forever, at least till his long life came to an end. A long life was the secondary effects of drinking the elixir. I can say that I am happily married to a man I would die for. Whose children I would lay my life for. But the current state of our relationship. Our trust? Well, that's where my sturdy bridge began to rock back and forth. And it started to rock back and forth when..."

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City of Gumbald, Mertens Flat

(Present)

'DING DONG.'

"When she rang my doorbell. This affair that I am now apart of, with my former girlfriend, Bubblegum. Is being done behind Finn's back. Bubblegum found where I lived last year. I don't know how, but it didn't surprise me." Marceline thought to herself.

Marceline was finished cleaning the entire home. She washed her hands and face in the bathroom before she could go and answer the front door. Making sure she looked good in a hallway mirror. Marceline unlocked the door and opened it. Standing in front of her was Bonnibell Bubblegum.

"Hey babe. Just got finished cleaning?" Bubblegum asked her, sounding cheerful and delighted to be in Marceline's presence.

"Yep. Just got finished cleaning. Would you like to... come in?" Marceline said, inviting Bonnibell inside.

"Don't you always." Bubblegum replied, taking a hold of Marceline's face and kissing her.

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After School

Returning back home on their school bus. Nightbolt and Darcy jumped off of the bus and ran towards their home. Nightbolt reached into the pocket of his pants to grab his keys. Pushing the one key into the lowest lock. He turned and unlocked the door. Pushing it open slowly. He left it open for his little sister to come in and close it when she was inside. Heading further into his home. Nightbolt went into the living room to see if his mother was there. She wasn't. Attracted to an unusual sound repeating over and over again that was coming from his parent's room. Nightbolt, a little older than his sister and aware, thought it was just his mother and father being 'friendly' as Marceline described it to him when he accidentally walked in on them one time.

Pressing the side of his head on the door first. Nightbolt listened, and heard the voices of two women. One was his mother. But the other!

Pushing the door open with all of his strength, and breaking the lock and hinges off of it. Nightbolt saw a pink slender beautiful woman grinding to a stop on top of his mother, who had her hands and fingers sunken deep into this pink woman's buttocks. Feeling her heart fall to the bottom of her stomach. Marceline pushed Bubblegum off her and jumped out of her bed. Nightbolt only caught a glimpse of it. But he saw a small 'willy' dangle from between his mother's legs, before rapidly shrinking back into the base of her flesh.

"Nightbolt! Honey it's not what it-"

"Mom. Why did you have a willy just now? I thought you said only boys had that. And who is that pink woman, and why was she on top of you." Nightbolt asked, sounding disconnected and shocked.

His eyes took him from Marceline coming over to hold him, over to Bubblegum who had a devilish smirk on her face. She waved back at him so casually. This was the wrong acknowledgment. As Marceline, naked and bearing it all in front of her young son, knelt down to take her son out of the bedroom. Nightbolt lived up to his name. With a flash of light that turned everything black first, before lighting up brightly immediately after. Nightbolt sent his mother flying back from a black lightning bolt he discharged from the palms of his hands as he pressed them against her chest.

Turning back around to run out of the room. Nightbolt grabbed Darcy and carried her, much to her protest. "Nightbolt, put me down brother!"

"No Darcy! I'm taking us back to school, where dad can come and pick us up!" Nightbolt manifested a pair of black wings from his back and flew him and his little sister back to school.

Back inside of Marceline's home. Bubblegum checked to make sure Marceline was not hurt. "You okay beautifu-"

"Get out Bubblegum, GET OUT RIGHT NOW!."

"Marceline it was nothing. He was just a little spooked that's-"

"I SAID GET OUT, NOW!" Marceline hollered angrily.

"What are you afraid of Marceline? Didn't I tell you before you left me seven years ago, that I would end up finding you. And when I found you, I would never let you go again. NEVER."

Marceline had sustained second degree burns all across her chest, arms and face. But her demonic healing ability, slowly healed her.

- Continued in The Final Part, Part 3