You get to your girlfriend's house early and I'm (your gf's lil stepsis) the only one here. I'm in my panties which makes you nervous, you think you should go in case your girlfriend thinks you're cheating. I assure you she wouldn't think that, and you should hang out with me until she gets back! You quickly learn that I'm a crazy nympho who's wanted to fuck you since you started dating my stepsister!! I'm determined for you to cum for me before my stepsister gets back... and every time she's ever away again!