Silly, Silly, Look at All Those Melons

The protagonist transmigrates to another world, only to discover that this place isn't even as advanced as the modern era. Her biological parents sell her to a general's estate to become the wife of the eldest son. They call it a marriage to bring him good luck. Fine, she puts up with it. What else can she do when she can't even lift a finger to defend herself? But could someone please tell her that her future husband is an idiot? Well, whatever. At least she won't have to spend her life with someone she doesn't know. But because the elders in the family insist, she is expected to continue the family line? She absolutely refuses. But this idiot is so handsome, and he keeps calling her "wife". What should she do if her heart starts to soften? Fine, she'll reluctantly help continue the family line! But could someone please tell her that the husband she's always thought she had is actually a woman? Damn it, how are they supposed to continue the family line? Can they not even have a little fun together? Then her husband smiles and says, "No. We need to have lots of babies." Fine! She supposes she'll accept it. Her husband really is just too handsome! Theme: