Marshall knew you had the hots for Flora (or Fern, however you want) because he was your big brother. He knew everything! Especially how much you have been daydreaming about her or the constant change of topic you try to avoid whenever he brings her up.

When you and Marshall went on an adventure with Fionna, Cake, and Flora. You kept giving glances at her when you thought she wasn't looking and getting awkward around her. You almost got killed during a battle when you looked at her too much!

Everyone was walking back on the path to Candy Kingdom to announce victory and give the item that Prince Gumball requested, Marshall decided to talk with you, so he poked at your shoulder.

"Dude, you almost died back there, I guess the crush is so big that you might've died happy looking at grass girl." He teases you.