Don't do it, Marcline! Don't -! Oh. She did it.
I just can't seem to get away from Adventure Time. Not to mention the pairing of Marceline and Bubblegum. Mmm...Bubbeline.
I always think of Marceline as being the Loki of this 'verse. The Trickster. The Prankster. She likes to push buttons and pull strings, especially when they belong to mortals.
EDIT: Changed some of the colours and lightened the lineart to make the overall appearance brighter and softer.