Your dad is showing you and your stepsister pictures that your mom took on vacation. They're quite boring and you can tell that your new sister is eyeing your cock as it bulges out of your pants. Your dad is still putting up the pictures on the projector when you come back from the washroom so you stand politely behind the couch. All of sudden your step sis comes creeping up on her hands and knees so she can suck your cock as she hides from your dad.
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