This is a JAV description from "Kosu Pako Hametori Ojisan".
He features cosplayer Y-chan, known for her 111cm M-cup breasts and large buttocks, in a "good wife fox" costume. He sets up a scenario pretending to do a normal photoshoot, gradually transitioning into sex.
He uses a sex toy as a ruse, claiming it relieves shoulder tension, to gauge her sensitivity. Y-chan, despite initial resistance, quickly becomes aroused. He attributes her quick response to her likely habit of masturbating.
He punishes her with a blowjob for allegedly soiling the floor with her squirting, praising her skilled oral sex. However, he accidentally ejaculates prematurely.
Reassuring viewers, he proceeds with a breast job, which revitalizes Y-chan. He describes the pleasure of her large breasts and struggles to contain his ejaculation while inserting his penis.
He finds her vagina equally pleasurable, but his body instinctively wants to ejaculate. He perseveres, thrusting into her despite the urge, enjoying the shaking of her breasts in various positions. He also highlights the pleasure of seeing her large buttocks from behind.
The scene concludes with penetration in a normal position, leaving him highly satisfied. He suspects Y-chan is a "perverted girl" based on her reactions during sex and expresses his desire to film her again. He also mentions including bonus footage for viewers' enjoyment.