Monster Romance MR

One night, I was a fully functioning man and yet the next day I woke up in the body of a woman! Not just that, I woke up in the body of the successor of the dukedom, who just happens to carry the curse of becoming a monster! And the so-called useless third prince of the kingdom has sent me a marriage invitation for some reason!
What am I supposed to do? How am I going to survive this predicament?