In the dim light of the closet, Martin's stepsister, a picture of innocence with her rosary beads clutched tightly, finds herself in a moment of weakness. She can't help but notice the growing bulge in Martin's pants, a testament to his desire for her. With a shuddering breath, she reaches out, tentatively touching him. Martin's body responds instantly, his cock hardening at her touch. She whispers, "We mustn't," but her hand doesn't stop, instead stroking him through his clothes, feeling the heat of his flesh. Martin's breath comes in ragged gasps, his body aching for her as they both struggle against their taboo desires.