I'm preparing a new game (Patreon)

I'm starting to make a new RPG game about the last colony of the human species that is looking for a new home by traveling in a spaceship. The main character is the only surviving man in the ship in which there is a female crew including his mother and sister. The main task of the main character is to save the human species from extinction, so he has to seduce everyone and make them pregnant, but it will not be easy because the main character has a weak charisma.