This can become a huge amount of work, but I thought, why not add an adventure mode? The protagonist himself wears a "cursed" chastity belt that cannot be removed but can be transformed into an image of one of the protagonist's random inventory of chastity belts, so he embarkes on a journey to find a way to open it, selling various chastity belts and collecting clues along the way. Then every hostess or other buyer I meet wants the protagonist to experience the protagonist's own products first, or have ideas about the protagonist himself, and so on. I think this will be very interesting.