Mazy Myers, the sexy, nerdy stepsister, decides to conduct a hands-on study of her stepbrother Joshua Lewis' massive cock for a school report on orgasms. Starting in the study room, she tentatively measures and strokes his length, her curiosity growing. They move to the bedroom, where she explores his girth and depth, bringing him close to climax. Mazy, now aroused, hops onto the bed, riding him cowgirl-style, her petite frame bouncing as she takes his cock deep. They switch to doggystyle, her small ass up in the air, before she takes him in her mouth, deepthroating him until he cums, which she eagerly swallows.