Your sister loves the night life, of drinking and partying. To pay for it she makes porn videos which you’ve just found.

Your cute, innocent looking stepsister, randomly ask one day if you can help her train to be a pornstar.

"Oh shit, I'm sorry!"

"Sorry for what? Our daddy taught us not to be ashamed of our dicks. Especially since they're such good size and all."

Your sister loves the night life, of drinking and partying. To pay for it she makes porn videos which you’ve just found.