There is a comic book called I Hate Fairy Land, About a little girl that goes to fairy land to go on a one day adventure through Fairy Land and then return home. the story takes place about 40 years later with the girl still adventuring, mentally she is 40 body she is still 6 or something, and goes a little crazy.

As for the bases for the RP Story, Two friends are hanging out one of which having to baby sit their younger sister, they put her to bed and a little later hear a weird sound coming from her room, the two go check on her and see some kind of fairy lady take the sister through a portal and the two friends chase after and land in a fairy land like world. Think of a world of a combination of Candy Land, 80's care bears, my little pony (both 80's and present) and a Lisa frank styled world. Being individuals that do not belong in this world every thing is trying to kill you or covert you into something. PM if you would be interested in a slightly mature like story, in a land of cute and fluffy things.