You're hanging out with your stepsister when she reaches up to stretch and you catch a glimpse of her armpits. Unshaven, just how you like. She notices you staring and quickly realizes it's at her armpits. She teases you about your little armpit fetish and you start growing a bulge in your pants. She tells you to take care of it before mom and dad get home. You suggest letting you fuck her so you cum quicker. She obliges and you begin pumping away at your stepsister. She's licking and sniffing her armpits while your cock plunges into her tight pussy. You know it's wrong, but it feels so good. She tells you to go ahead and cum inside her so you don't make a mess. You creampie your sister and hurry to get dressed before your parents come home.