Kneeling before her stepbrother, the eager sister takes his hard cock into her warm, wet mouth, her fingers playing with his heavy balls. She sucks him with abandon, her lips stretched wide, gagging slightly as he hits the back of her throat. She looks up at him, her eyes watering, as he thrusts into her mouth, using her for his pleasure. She loves every second, feeling his cock pulse and swell, ready to explode. She pulls back, jerking him off as he cums, ropes of hot semen coating her face and tits, marking her as his.