Mayumi has been dating her boyfriend for a year and together they've enjoyed various kinds of play, including sex toys, lubricants, oil, and light BDSM. Recently, she's become particularly excited by creampie filming, and feels as though her boyfriend is willingly cooperating with the filming. Shy by nature, Mayumi feels increasingly self-conscious knowing the camera is watching her, which only heightens her sensitivity and arousal, making her wetter. Riding on top of him with her genitals fully exposed to the camera, she grows more and more excited, eventually losing all inhibition—her face and moans unrestrained—as she continues relentless, nonstop thrusting. Her passion drives him wild as well, quickly leading to a second round. While she loves the intimacy and time spent with her boyfriend, Mayumi has also begun watching adult videos to explore her own pleasure further, fueling her desire for deeper excitement and motivating her to participate in this shoot. This work focuses on the dynamics of her relationship, the depth of her sex life with her boyfriend, and Mayumi's personal transformation as she secretly engages in this filming.