Married Piano Teacher's Naughty Fingers (1998)

Sinopsis

Akio became the president of a mid-sized manufacturing company at a young age. His wife, Michiko, got married as a virgin and has been devoted to her husband ever since. He is beautiful and chaste, and uses his professional piano skills to teach piano lessons. For Akio, she was all about his wife. But should such a wife be prevented from experiencing another man for the rest of her life? If my wife is embraced by another man and she loves me even more than that, wouldn't that be true marital love? That's what I secretly started thinking. Akio brought a camera into his bedroom and began filming Michiko naked. Michiko resisted at first, but she gradually began to open her thighs. And I started to want stronger stimulation...