@thesoulessvampire now I'm curious to see what the problem is!
Hmm. . . As for tips, I gotta tell you to continue writing from the heart because the main thing is that you enjoy writing. If you just write for other people's entertainment, it will only cause you stress and diminish your love for writing. Just one tiny, minor suggestion would be is to separate the words a character is saying because that could get confusing, like when another character is speaking, start another paragraph.
"Hey," Fionna said. "How are you?"
Marshall shook his head and stubbornly turned away to hide his blush. "N-nothing's wrong. Shouldn't you be going on your date with hothead?"
And that's about it. I enjoyed reading your story. Thank you for suggesting it to me!
P.S. Will FP stop being a problem because Fionna catches him with Flare?