Aniyome Chijoku no Time Sale ~Otto ni wa Ienai, Himitsu no Part~

Suganami Fujio is a director known for his adult videos with good planning.
This time, his target is his sister-in-law, Suganami Tomoko, who works at a supermarket. Though younger than Fujio, she’s a stunning beauty—the perfect target.
Under the guise of filming a “documentary,” Fujio sneaks into Tomoko’s workplace and secures permission to shoot. While pretending to film a serious documentary, his camera is always focused on his sister-in-law.
Once the initial filming wraps up, Fujio calls Tomoko in for an “individual interview” during her break. He has her sit on a chair pre-equipped with a vibrator and begins the interview. Then, to slowly draw her into the throes of pleasure, Fujio flips the switch on the vibrator…

[Translated from dlsite]