Here's a oneshot.
Marceline was sitting alone as usual little diner that she always spent her mornings at. The usual customers were here, along with a few regulars that randomly showed up, with no schedule. But there were very rarely newcomers to Mr. and Mrs. Pig's Diner, and when there were, Marceline always noticed. The door chimed as it opened. Marceline checked her watch. Pheobe and Finn are already here and no one else is here around 10 on Saturdays… She looked up from her book to survey her surroundings. A particularly adorable teenage girl with pink hair wandered in, looking confused at a map.
"Hmmphff" Marceline stood and walked over to her. "You lost, darling?" She smirked her devilish smirk, knowing that she was totally going to get this girl to fall instantly in love with her instantly. But this girl merely looked up and hummed in thought.
"Yeah, can you get me to the Library?" Marceline blinked, her smirk didn't work. I'm gonna get this chick to like me. She smirked again.
"Sure," She sauntered over to her table and picked up the book she was reading, and dropped a dollar ninety-five for the coffee. "In fact I was heading that way to drop off my book."
The girl stuffed her map into her back pocket. "Right… you know that isn't a Library book…" Marceline blushed.
"I-It is…"
"Well let's get going, yeah?" The pink haired girl walked out the door. Marceline furrowed her eyebrows. Not many people can make Marceline feel uncomfortable, but somehow this chick could. She ran up to her.
"Well, you got a name?" The girl looked up to her.
"Bonnie, how about you Miss Aviator Shades."
"Marceline, and Aviators are cool. And incredibly sexy" She stuffed her hands in her pockets.
"Sure, just like how I'm supposed to think you're my knight in shining armor for you walking me to the Library."
"Wha- no!"
"Well what else are you trying to do? I've heard this story a billion times before. A poor defenseless girl meets an over-confident bad ass, who does one thing for her and they instantly fall in love. Well it's not going to work."
Marceline stopped in her tracks. "Uh… Ok… We're here…" Bonnie winked as she stepped up the steps. Marceline started to walk back to the diner when she came across Bonnie's map on the ground. "Oh she dropped her…" Marceline smirked and ran back to the Library.
….
Marceline waited, leaning against the stone lions. When Bonnie walked out, Marceline smiled to her. "So you were lost, yeah?" Bonnie laughed
"Yeah, why?"
"Well, considering this is the map is of a college campus two hours away, I think you saw an attractive bad ass through a diner window, and decided to get her attention and play mind games to make this bad ass instantly fall in love with her." Bonnie's cheeks flushed, and not from the cold air around her.
"Uh, I… uh…"
"Because it worked." Marceline said with an astounding amount of cockiness in them.
"Wait, what!?" Bonnie ran up to her.
"What? Surprised Miss Aviator Shades fell for a nerd like you?" She smirked and turned to face her "Me too" She lowered her shades and winked. "Here's your map, and if you don't mind I'm going back to my diner and have my strawberry milkshake." Marceline walked off, leaving Bonnie to stare at the number scrawled across her map.