(Fionna's POV)
"Thank you, Ice Queen. See you at the party tomorrow!" Fionna called back to the queen of ice as she walked beside PG who was back in his own body. He seemed alright with his wound bandaged and a grin on his face.
"So how did you get mixed up in that anyways?" She asked him.
"I was in the lab working on a mixture that could put out fires. A lot of fires had been going on in the kingdom lately. That is when the Fire Prince showed up at my door. He asked me what I was doing and when I started to explain he got really angry. Then after a few exchanged words, he handed me a jewel. I then found myself in his body," Gumball explained. Fionna shrugged and kept walking, keeping close to Cake.
"I hope Marshall is alright," She said quietly.
"Why, what happened to him?"
"He… uh… kinda was switched and put in your body."
"What?!" He gasped, but then he looked away.
"PG, you do know that he saved you- well, not you, but FP in your body when we thought he was you- from the Ice Queen? And took your place? In an ice cube?" Fionna asked. Prince Gumball grinned.
"Well, when you next see him, tell him I said thank you." She sighed and looked at the ground as it changed from snow to grass.
"But, Fionna… Would you explain what happened when I was first imprisoned?"
She explained about the kiss and how the Ice Queen came, and even about the kiss between her and Marshall. By the time she finished, they were standing in front of the Candy Kingdom.
"You need to go comfort your people-"
"After this. Fionna… I have been searching for the right words for the longest time now…and I wanted to say… Thank you." Her face went red as he spoke.
"For everything," He said as he leaned forward. She closed her eyes nervously, but to her surprise he placed a kiss on her cheek. She blinked and met his gaze.
"Y-your welcome," she said, flustered.
"Boo!" She heard from behind her. Fionna jumped, clearly startled.
"I told you not to do that, Marshall!" She said, whipping around. But to her surprise he was carrying the Fire Prince. She drew her crystal sword and pointed it at the flame prince.
"Hey! Fionna put the sword down. Trust me," Marshall said. He explained on how he had found the real FP tied up when he was back into his body. Marshall set FP down and he stumbled a little before looking at Fionna apologetically.
"I am sorry," The Fire Prince said aloud, "I really am."
"It's okay, FP, it wasn't you who traded places," Fionna said comfortingly.
"Um, hello!" Cake spoke for the first time in a while, "Girl, have you thought about who the fake FP could be?"