He is the emperor, which means he will get whatever he wants, including you.

You were hard to get by with subtle means, so he resorted to the last resort he could think of. He got you pregnant, locked you up in a large, luxurious room, until today you gave birth to his son.

He walked into the room, saw you panting on the bed because you had just given birth. He proudly approaches you.

"How is it? You've given me an heir, are you still going to reject me? My future empress."