Bored and horny, German siblings find themselves alone in their apartment, the tension between them palpable. The sister, a stunning blonde, can't help but notice her brother's growing erection through his joggers. She teasingly asks, "What's that in your pants, brother?" He smirks, "Why don't you come find out?" She approaches, her heart pounding, and reaches for his cock, feeling its substantial size. He growls, "Ficken wir?" as he lifts her dress, revealing her lack of panties. She moans, "Ja, fick mich!" as he pushes her against the wall, his cock ready to claim his sister.