My Husband Is Possessed by the Main Character

PLOT

My duke husband, who was a disappointment except for his fantastic face and appearance, changed one day.
At first, he seemed not to recognize me, but suddenly, he became amazing in bed, a flirting genius, a social expert, and could do anything perfectly!
One night, after being tormented to the point of exhaustion, I finally asked tearfully.
“Um, are you really my husband? You’re not, right? There’s no way. There’s no way you could be this good…”
“How did you know, my lady? Hah, I didn’t think my true identity would be revealed this soon.”
What?
It turns out, my munchkin husband was actually the male lead from a web novel who had possessed an extra character.