Continue sleeping with your sister.

From Create Your Own Story

You shake your head, "Sure, but right now we need to get back to the Ceremony." You say straightening out your uniform. "I'll see you there." You say slipping out of her room and back into the palace's hallway. You hastily make your way through the palace and to the great hall where the ceremony is to take place stopping occasionally to smother out any folds or creases that might have formed due to you hastily performed lovemaking session.