Himegoto-Ai ~Hameru Oyako no Kimochi Yosa~

The King Rockla leads his army to suppress the rising power of barbarians on the border of Welgaria Kingdom. Meanwhile, his son, who has long desired his mother and sister's bodies, plots to make them his own while hiding in the court. His sister, after finishing her swordplay practice, touches herself while murmuring her engagement with her fiancé, while his mother satisfies herself with her experienced hands due to her husband's absence. The prince watches them lustfully, believing it to be a once-in-a-lifetime opportunity to make them his own.