Your naughty younger stepsister has been so unruly that your mom and stepdad have told you to keep a watchful eye on her while they are out of the house. She sees right through to your true intentions though, and quickly realizes you're delighted you caught her in her underwear. You're repeatedly told to take your cock out.. and your stepsister evens goes so far as to tell you how to jerk off, getting naughtier and naughtier with her dirty talk! She's always been a little bossy, but never like this. She persuades you into fucking her, and you're both hopeful you can cum before your parents come back home.