Blackmailing My Step-Sister

You catch your hot step-sister trying to sneak out of the house, so what do you do? Threaten to get her in big trouble if she doesn't blow you.. and she gives you the best blow job of your life! Taunting you the entire time, telling you that she is going to suck your cock so good you will never think of another girl. Showing off the big load of your cum in her mouth before gulping it down, then walking off pissed.