Tegan, the innocent schoolgirl, is given a unique form of punishment - cleaning Derri's mouth with her own. Derri, her inked stepsister, stands tall, her body adorned with tattoos, socks pulled up to her knees. Tegan, hesitant but curious, licks Derri's lips, tasting her sister's arousal. Derri, hungry for more, grips Tegan's head, pushing her mouth down onto her pussy. Tegan struggles, but Derri's grip is firm. She gags, tears streaming, but Derri doesn't relent until she cums, filling Tegan's mouth with her sister's cum, which Tegan swallows, her eyes watering.