After Sunset is left with no family to take her in, Celestia decides to take in the young and extremely gifted mare as an adopted daughter.
This story expands on the background of Sunset Shimmer, how she was shaped by her new found mother, how she developed into the mare she was and how she ended up going down a dark path.
Editor: Skylarking the Stargazer https://www.fimfiction.net/user/229362/Skylarking+the+Stargazer