Give me a long plot abount a princess who must make a royal pact with a deity on her sixteenth birthday in order to receive the magical powers that will allow her to protect the kingdom. But the princess is wrong in the incantation and seals the pact with a demoness. Unlike deities who demand prayers, demons demand to give in to a capital sin. The demoness the princess has made a pact with is a demon of lust, so the princess must give in to the sin of the flesh, by having sex in order to use her magical powers. The demoness being vicious, she demands that the princess become the lover of her own mother the queen. The queen, a lonely widow, is initially reluctant to have a relationship with her daughter, but ends up giving in for the good of the kingdom. This is how the princess ended up getting pregnant by her own mother. Although the people are outraged by this couple, they both will be a happy couple and good mothers for their beloved child.