Fuck her ass twice as hard as before
From Create Your Own Story
You look into your sister's eyes and tell her you lied about not fucking her ass again. You grinned widely and told her that you liked seeing her in pain. Julia looks back at you with her eyes and mouth wide open, and tries to scream, but nothing comes out.
You push Julia onto her back, take her legs, and put her in the piledriver position, with her legs up and your cock quivering above her ass. You place your cock on the bud of her anus and start pushing inwards. Julia, her face turning red from being held upside down, whimpers out a "Jacob, please." before you ignore her and thrust inside with all your might.
You spread her legs farther apart, causing her ass to squeeze around your cock, and start pumping in and out of her like a madman. "Aaaugggghhhhh!". Julia cries out as your cock pierces through her anus and tears her skin. She begs you to stop as the pain is too unbearable for her to continue. "It hurts, Jacob!", she pleads. But you have already decided that Julia is your bitch for today and you do not care if anyone hears.
Suddenly, the door opens and your mother is standing there, shocked.
What happens next?