Maud and Limestone were working. Neither of them liked each other's company, but as siblings, they had to get along. Once Maud broke a boulder, she found a stone. Limestone happened to also notice.
One argument led to another, and soon both began fighting. After a wish that Maud uttered, both fillies have to work together to deal with this mess.
Special thanks to Chrome Masquerade who edited this
Credit to the artist here: https://derpibooru.org/images/1368009
I am using their drawing for now until I can get someone to make a drawing of Maudstone