Take Responsibility, Duke!

The Southern Duke Remtus, born with a body of both sexes. He has been secretly soothing his body that has been burning every fortnight, but this fortnight, his passion is even more intense because of the night he spent with an unknown man a few days ago. Remtus, who has barely managed to soothe his passion, receives a letter from a northern marquis who has no connection with him. Is this a marriage proposal?!