A mother's curiosity piqued by her son's sudden growth spurt, she can't help but marvel at the size of his cock as he showers. He catches her watching, his hand instinctively wrapping around his girth. She licks her lips, her pussy throbbing with desire. They meet in the bedroom, their hearts pounding with anticipation. She takes him in her mouth, her tongue tracing the veins, her hand stroking his length. He groans, his fingers tangling in her hair. She pops off, her breath ragged, "I want to feel you inside me, son. Fill me with that big dick."