Spoiler!
ML knows that the MC that looks at him worriedly when he fought Soruk existed somewhere, but MC wouldn’t tell him that she cares for him. MC laughs it off, saying she is a highly sought-after politician and strategist by many countries, does she not know what it means to be tied to him? It means in the event that the emperor accuses ML of treason, they both will die as there is no way ML would let her go. ML says he is not letting her go because ‘HE LOVES HER’, not because of any political motivations. MC of course, does not believe in his so-called love, and she refused to be dragged along with it.
So, since she entered into a political marriage with him, then she will see to it that there would be an heir. (I have no idea why she would think about a heir to secure her position actually) She recalls back that previously she waited until she was 37 years old, and then it was too late to have children, so nobles turned their backs on her by then. So, she thinks now, she is back to 23 years old, she should seize this chance. ML thinks inwardly it was a good thing back then, that he killed all those da** nobles, and then told MC to do whatever she wants – use him to get a successor if she wants to solidify her standing in the empire a.k.a be an empress (after the rebellion). ML starts saying he loves her again and again and well, they do the deed for days.
So, since she entered into a political marriage with him, then she will see to it that there would be an heir. (I have no idea why she would think about a heir to secure her position actually) She recalls back that previously she waited until she was 37 years old, and then it was too late to have children, so nobles turned their backs on her by then. So, she thinks now, she is back to 23 years old, she should seize this chance. ML thinks inwardly it was a good thing back then, that he killed all those da** nobles, and then told MC to do whatever she wants – use him to get a successor if she wants to solidify her standing in the empire a.k.a be an empress (after the rebellion). ML starts saying he loves her again and again and well, they do the deed for days.
Denise is finally ready for her sleep and goes into the cave, and transformed into her white dragon body. While Denise sleeps, ML comments that their future dragon kid should sleep a little later so they can spend more time together as a family. MC seems to think that she is only going to give birth and that the successor training and taking care of the dragon kid is all ML’s responsibility.
I like to post spoilers for the stories I find interesting because I don't have much time to read novel due to busy schedule
you will find me in most romantic historical manhwa comment sections 
you will find me in most romantic historical manhwa comment sections