What if Bubblegum decided to make a study on many creatures of Ooo and hires many people to help her with the studies and many of them happen to not only go into details of said creatures lives... but their mating habits as well... look inside to find out more on BCS. (Lemon filled from start to finish.) (Ash Death in first chapter) (Male OC's will be used with female humanoids.)

Shortly before the Mushroom War, people tried to live normally. Elise was an ordinary teenager who had the (bad) luck to meet Hunson Abadeer, the high school fuckboy.

Cuando la estructura de todo el multiverso se ve en grave peligro por una sola persona, es deber de un grupo específico de personas arreglar el desastre, y la legendaria heroína Fionna es la líder; sin embargo ese es sólo el inicio de esta montaña rusa de secretos, engaños, y revelaciones.

(Have permission from Shywhitefox to use the Chaos rings in other stories) What if a blacksmith made a certain item that allowed many to become freaking RPG characters of sex more or less... enjoy a mass harem story where many can become their own lead in harems while the Chaos Rings boost various attributes... expect straight, Yuri, Futa, and and more so you have been warned.

Realistic/human AU. Finn is a freshman in high school, being raised by his adoptive brother, after the death of their parents. He's an average teenager, with raging hormones, and a posse of female friends.

When Finn and his friends are being judged for past crimes, they're sent to a Kingdom that specialize in punishment… and pleasure. Would they overcome the trials or be broken? Harem as usual. Will have light and dark lemons. Some OC's are owned by TME. This is a co-op.

Finn has decisively defeated Tatsuo Nagumo, Warlord of the East, in pitched battle, but there's no time to rest yet. As the deadly currents of intrigue and rebellion continue to swirl around his family, his closest family risks being swept away. Can the King of Ooo defeat the deadly plots of his implacable adversaries and win the Gum War once and for all?

After the events of "Frost&Fire", Finn takes the crown and becomes the new Ice Prince before freezing himself to sleep. 4 years later, he wakes up only to find out that a dark evil is trying to take over Ooo. Will have some bits of "Shadow of Mordor" and "Shadow of War" . Also will have a harem for Finn and a harem for an OC that belongs to my great friend and Co-writer, TME.

The Sequel of Fire in the heart(Rewrite). it's the Human and Vampire Twins birthdays and Finn and Phoebe and Marceline are gonna teach them about being a hero and others stuff.

A soft tone met his ears, it wasn't obscured by the heavy accent of it being transmitted over radio waves, nor was it frizzed up by poor mic quality. A gentle breeze whisked around his face, it was warm, smelt of coffee, with the lightest twinges of mint. - Or: Finn gets cursed by a witch and lives a life he could never experience.

Simon gets the power of the crown, but he doesn't lose his sanity or Betty. The war happens and Simon and Betty find Marceline and raise her as their own. The new family face many difficult challenges. A story in which a hero will rise and help defeat a great evil in the distant future. A different Ooo will rise and take shape. Also there will be many crossovers.

This is a what if story of how the Silent King episode ended differently if Finn stayed King. Co-Op story by me and TME and is a actual B-Day gift. Features some of our go to OCs. No flames please.

Marshall Lee can't stop teasing Fionna, and it drives her nuts! Nuts, as in, makes her want him so bad. Cute, funny start with a hot, burning ending. If you are not satisfied with this garbage, you get TWICE your trash back! As always, you're welcome, world. I know this is what you all really want. (SMUT)

It's Halloween, and all of Aaa is preparing for the biggest bash of the year in Candy Kingdom. Everyone except Fionna, who seems to always be a target for the trickster Vampire King this time of year. She had no intention of going. But she did go. And it was awful.

The 100th new story on my side of things, had help with Atomsk the Pirate King to help this story to be... plenty of tropes, drama, sexy fun starting near the end of chapter 2... Emerald and many more have one hell of an Isekai adventure to Ooo... but with some twists... please enjoy the time hopping adventures of the new Glob of time Emerald who saves Ooo ages from a great evil.

(Completed first arc... next arc will be on Atomsk side) what if instead of Marceline being able to absorb the Vampire King's essence back into her, the cloud surprised everyone and tried to attack her but Finn gets in the way and as a result... he gains the Vampire Kings powers and becomes a vampire himself... get ready for A New Vampire King. (Lemon warning(Finn X mass Harem)

Maybe it was the way she looked at the falling snow with childlike wonder, or the way the white flakes looked beautiful before they melted in her hair; but in that moment, Bonnie knew everything was going to be okay. High school AU. (slow burn; reupload)

After the saving of Betty from Golb. Marceline finds out her dad has true feelings for Finn and Jake. She has to save their souls after Hunson sucks them up!

Dos chicas completamente diferentes, unidas por su trabajo de cuidar a una autora famosa. Adaptación del libro de Andrea Tome

Falling in love is easy. Letting go is not. Immortality is great, until you realize it kills you in a different way. Is this something that can work, or do all things break with time? A collective story about how Fionna and Marshall Lee discover their feelings for each other. Rated: M for adult language and smutty goodness.

Sometimes, all Finn wants to do is try to help. All the time, Finn becomes collateral damage.

Based on my THOROUGH distaste for the abstinence curriculum and the horrible lack of sex ed in the public school system I give you... THE TALK... except GUMBALL is going to give it to you, and he manages to do a worse job than the government! Imagine that. Good thing MARSHALL is here to show us how it's really done, right kids? NO LEMON, so rated T for obvious discussion of sex.

When finn feels like he has no purpose after the series finale he is revealed the truth and makes a decision which will not only effect his legacy but all of OOO

(Co-op work, harem version, based off of Scott Pilgrim VS the world) What if Marceline and Bubblegum had a falling out of sorts thanks to a prank of Marceline's and shortly after she meets a new friend who would help her in many ways, enjoy what happens when the main OC (You know its Emerald by now people) fights 7 people for fragments and defends Marceline... enjoy.

I do not own Adventure Time or its characters