My parents have no idea that my stepsister and I are secretly in a romantic relationship. At first, we just flirted and made out normally while hiding from them, but lately, things have felt a bit routine. For me, the secret of our hidden relationship was enough. However, my stepsister wasn't satisfied with that. She eventually started craving extreme thrills, leading to the incredibly risky act of climbing onto my lap while our parents were right there, hiding the penetration under her skirt to fuck! At first, I was terrified, thinking "this is too dangerous!", but I soon became captivated by the tension of this under-the-skirt sex, and my cock got rock hard! Furthermore, when we changed locations for sex later, my stepsister's excitement skyrocketed, and things became incredibly bold! Performing such absurdly indecent acts beneath the surface of ordinary daily life... once you taste that sense of immorality, there's no going back!
