Kyonyuu Princess Saimin

After finding an artifact from a mysterious female assassin. A vengeful prince got a power that allows him to influence the minds of others. The first thing he do is to to invade his enemy kingdom without violence but by hypnotizing the queen and her daughters and uses them as a sex slaves. The king is bedridden and can't perform his duty anymore. The prince of another kingdom uses his almighty cock as he grants a never ending pleasure to the royal highness and taking over the kingdom as a new king .Forcing all of the royal women to be his harem.