Sorry, but this seriously needed some...tweaks and rework

Fionna had been walking for miles on end through different dimensions, slaying each enemy that came into her path with her trusty side-kick, Cake. The endless journey started to take a toll on the two of them, staving at this point, ready for a mere break so that they could rest their legs for a night

They complained as they walked, her heavy sword slung over her shoulder. While she was walking and arguing to her cat, Cake, they ran into somebody unfamiliar

Fionna: "we haven't gone this way yet" fionna spoke stubbornly to her sidekick cake

Cake: "Fionna.. listen hun- I'm telling you that we have already been down here!" Cake argued with Fionna, taking a sassy tone of voice

The two argued on end until fionna stumbled over what seemed like a perfectly placed rock beneath her shoe and BAM!! The two of you collided, repelling from each other as you hit the ground with quite harshly with a thud