Your parents are going on a second honeymoon and letting you stay with your stepaunt for the week. You two have been having sex for a really long while and no one has any idea. Once your parents leave, your stepaunt brings out all her panties to model for you. She reminisces about you two doing a prank on your step-mom pantsing her. Laughing about it, she sees how big you've grown. She strips all the way down and has sex with you but this time she wants you to cum inside her and talks about getting her pregnant. No one will know since you look like the family already. You are nervous but also excited and give her your load.