Since her return to Equestria, Princess Luna has been having trouble containing herself. During the night, she doesn't sleep. Instead, she keeps herself entertained as best she can. When she realizes that this is futile, she askes her guard for help, and he happily gives it to her.

Third person pov, humanized, spanking, anal

Edit 2/2/2020: Oh gosh, this thing shows up pretty high in its category. I'm gonna have to update it in terms of quality.