Luna Mills, the brunette stepsister, is engrossed in her studies, oblivious to Donnie Rock's wandering hands. He pinches her nipple, expecting a reaction, but she's too focused. His curiosity piqued, he leans in, his massive cock tenting his shorts. Luna notices, her concentration shattered. She takes him in her mouth, gagging on his girth, her big tits pressed against his thighs. She sucks him off in their shared bedroom, his cock stretching her throat, her pussy dripping with lust.