Harem Queen Maker: Do-S Oujo to Nariagare!

Melodia is the beautiful princess of the mountain kingdom of Ralphind. She is at odds with her half-brother over the succession to the throne. Schneizel, her squire, supports her goal to become the Empress by doing all the dirty work behind the scenes. That includes satisfying her sexual desires. Even though she is still a virgin, Melodia has a sadistic fetish, and she is looking for victims to abuse!

Anna, an innocent lady-knight who rides a flying horse, and Gerda, a cool mercenary, become ensnared by the squire's schemes!

(Source: Nijigen Dream Bunko, translated)