This is a sad little ficlet dedicated to that one picture I saw once...Review if you've seen it too.
Author is askbubbline on tumblr, and the tag is 'an AU in which Finn and Jake never met BUbblegum'.
Two figures move slowly in the empty ballroom, dancing to slow music.
Marceline and Princess Bonnibel Bubblegum sway in time to the song.
Both are slightly worse for wear, harried and tired, but happy.
"It's been a long time since we danced like this."
"Mmm."
"What's wrong Marci?"
She looks at Bonnibel, who is looking concernedly at her.
"I'm sorry...I'm so sorry...I.."
A tear rolls down her face.
"I love you."
"You know I love you too."
Finn and Jake watch Marceline waltzing alone in a dilipidated ballroom, observing from the rotting, broken-down doorway.
"She's doing it again," Finn whispers.
"I know, dude," Says Jake, watching the tattered vampire sadly, "I know."