Do Nothing, Just Keep Watching

He hilts himself inside Bitch again fucking her furiously. Your mate just faces the door and rolls her tongue out, eyes rolled back into her skull. Your father forcefully grabs her around the neck and squeezes her close to his face muttering something just out of your audio range. She seems to enjoy it though, whatever it is.

Your father takes his pleasure, with her face still pressed to his mouth he grunts loudly crying out loud enough to hear "Bitch, who's cock do you like more?" He loosens his grip on her throat enough for her to reply.

Wasting no time she cries out "Yours, your cum tastes better!"

Your father kisses your mate deeply as a reward for her words. He draws his tongue across her face and announces "I have a good idea slut. How about you take my cum in that fertile womb of yours. If I knock you up he'll never know he's raising my brat."

A laugh bellows from your father as rage and inferiority battle for supremacy in your mind. You mate pulls you back to the sex in front of you as she begs your father to cover her face in cum instead.

"No slut, I must mark your womb with my cum. I'll ask my smart son if he knows any secrets to telling the father of a child. We'll both have your womb equal amounts whoever wins gets to keep you."

His pace quickens towards crescendo... now or never. Making a show of it you throw open the door.