Marshall snuck into the treehouse expertly through the moonlight, guitar hanging from his back. He knew every entrance, exit, and secret passageway in the house. He chose the weak spot in the roof of the attic, lifting up a branch to reveal all of the junk they kept up there. Yet again, he was unsure why he was doing this. Although, he snuck into their house often .When it came to Fionna, it seemed, he could be very illogical. Fionna was still in recovery, to his knowledge. Marshall was amazed at how slow mortals healed. He wondered how they survived at all. Although, his slash wounds were still slight scars. Marshall wondered if they would ever heal properly.
He was just going to hang around in the living room and wait until they got home, but he was intrigued by the collection of stuff in the attic. Most of it was nonsensical disorder, but there were a few treasures. Ancient books in languages he couldn't read. Some that he knew a little bit of. Amulets, weapons, and other religious artifacts that he was sure they didn't know anything about. The religious artifacts reminded him of his father, even though he didn't really remember his dad. Marshall grabbed one of the books written in Gaelic and another one written in Latin. He headed down to the main floor.
Cake would flip out if she knew he was here. She would probably ask for an explanation, but Marshall didn't have one. Except for boredom, and inviting Fionna to LSP's party. Cake was always wary of him, but never as high-strung as this. Maybe she somehow knew that her sister's near-death experience was a result of Marshall's actions. He hovered leisurely through the house, memories flourishing. Where his furniture used to be, Fionna's replaced it. The shelves that used to be filled with Ashley's potion supplies were replaced by small trinkets and trophies from Fionna's adventures. The same way that she replaced Ash in his heart. He looked through the fridge, and there was an uncooked steak sitting there waiting to be eaten. He sat on the couch, absentmindedly sipping it. Something with blood in it… It was a nice change of pace. He looked at the ripped painting on one of the shelves. It really suited the ambiance of the room. Marshall knew that Fionna was no interior designer, but the room definitely suited her.
The house smelled different. It still smelled like the same house, but with more of a sweet scent. He tried to struggle through one of the books. These languages were dead everywhere except in the Nightosphere. Apparently, they were old languages before the mushroom war. He picked up a little bit from Simone, and would commonly use Latin terms in codes back in the days when he was part of a gang. Marshall wondered if he was just going to wait here for Fionna to get back. He wanted to ask her to come to Lumpy Space Prince's party tomorrow… Hopefully she would be recovered by then. He strummed the chords for his song, thinking of new lyrics to polish it off.
Eventually, he became lost in his memories. Like the first time they met, three years ago when he returned from his trip around Aaa. She was still young, she still sounded like a kid. Funny, he scared the plop dumps out of the two, and after introducing himself he kicked them out of the treehouse. And stole BMO, messing up all their highscores. He then heard that two famous adventurers were throwing a party, and he wanted to meet famous people of Aaa. He came to the party, not realizing that it was just Fionna and Cake again. He decided that it was more fun to bother them, so he kicked them out of their new cave. Then he threatened to kill Cake… Maybe that was one of the reasons she was so wary of him. He had an epic battle with Fionna because she thought that Cake was actually dead. It was then that he decided they were worthwhile friends. That was back before he learned to properly use his Axe-Guitar.
From that point on, most of the stuff he did was just to mess with them. He found it much too fun, and spied on them regularly. Cake used to be so scared of him… It was liberating for some reason. He would set up scenarios just to see what the dynamic duo would do in response. He called his old 'henchwoman' out and forced her to do menial things such as entertainment. She was really just one of his friends that owed him a favour. Fionna took her place, being an honest hero, and Marshall kept putting her into awkward situations. Fionna was just fun to toy with. And Cake was too scared to effectively help her sister out. People thought that they were a couple. He just teased and teased her… Because he knew she could take it. He was pretty much using the opportunity to show off to her. Cake finally faced her fear and attacked Marshall, but this time Fionna was protecting him. They soon became the best of friends.
Or like Couple's Movie Night a few years ago. Cake had called him and asked him to come help her get a date. Obviously, she meant Gumball, so he agreed. He always loved messing with Gumball. Marshall was already inside the house when she called, and snuck up behind her. Marshall and Cake were competing over dating advice for Fionna, all the while Marshall was giving her terrible advice. He thought her gullible nature was cute, and used Fionna to prank Pinky. There was one point where he took Fionna out into the wilderness and they ran with a pack of wolves. They carried two of the wolves back with them and unleashed them into Gumball's room. Marshall silently chuckled at the memory of Gumball's expression. Eventually, Fionna asked Marshall to go with her. He tried to scare her away, but she wasn't even phased by his scariest forms. They just went and crashed the event.
So many good memories… It was hard to believe that they did all that cool stuff together in only three years of knowing each other. It made sense to him now. He loved her because she was simply the right one for him. Just thinking of her made his chest feel all tight and his cheeks warm. It was worth the struggle. He would never meet a girl like Fionna ever again. The last human.
[yeah...This was weak. I know. I just pretty much explained a couple episodes. But stuff's going to happen again, I promise.]