Mayuko is 30 years old, 159cm tall, weighing 52kg, with measurements of B89 (D), W62, H88, and blood type O. She works in the medical field and copes with stress by drinking alcohol. As a result, she has developed a soft, jiggly physique with slightly sagging D-cup breasts that wobble with movement, giving her a relaxed overall build. She has had 10 sexual partners—half through relationships, half one-night stands. Her first time was at 18, after graduation, with a same-age boyfriend, following a trend back then among female friends of watching AVs together. After viewing, everyone went home and masturbated while recalling the experience. During a sensitivity check, she willingly exposes herself when asked to pee and masturbates as usual. There's a spot on her back she's rarely been touched before; when gently stroked, goosebumps spread across her body and she instinctively arches, overwhelmed by a mix of ticklishness and pleasure. The line from her back to her ass is sensual, her nipples painfully erect. She begs for oral, but only fingers are used. When fingers enter, she nearly cries, "Fingers are inside me," and shouts, "I'm cumming!"—though she's already reached orgasm by that moment. "I came… I can't go on." Alone in a room filmed by two fixed cameras, her masturbation style remains unchanged since she was 15. She strips only her lower body, finding it more stimulating, pinching her nipples while slowly circling her clit. She spreads her legs wide like in childbirth, teasing herself. Her moans grow louder, her abs trembling slightly, then she inserts two fingers into her hole and vigorously pistons them in and out with a rapid hand job motion—pounding, "papapapapapapapapapapapa!" After repeating this for a while, she frantically rubs her clit with her index finger. Her breathing intensifies as she approaches climax, and at the peak of orgasm, she cums quietly, fading away with a soft sigh.