A Deal with Her Mafia Son-in-law

I am about to be forced to marry the most ruthless old mafia boss in the city. However, one morning, I woke up naked in an unfamiliar bed and realized I had sex with a stranger. The worst thing is, now he is standing in front of me at my engagement dinner.
“Mr. Guerrero,” someone says to my fiancé from behind me. “Your son has arrived.”
Great.
My one night stand is my fiance's son.
When I ask him to pretend nothing ever happened.
He chuckles. “And what if I don’t want that, future-Mrs.-Guerrero?”
My breath catches when he leans in close, his breath hovering over my ear.
“Or… should I call you mother?”