A Married Woman Who Keeps Horses(2001)

Otani spares no expense in enhancing the beauty of his wife Miyako, even allowing her to cheat on him with a young man, in order to make her look beautiful. However, he continues to worry about whether his wife is truly his, so he orders his subordinate Miyasaka to investigate Miyako's true desires. Around that time, Miyako meets Kurosawa, who is in charge of horse care at a horse riding club. Although he was a former champion jockey, he retired after an accident and treated Miyako coldly. The next day, Miyako gets revenge on him, and the two get into an argument, collapsing into the hay. Miyako invites Kurosawa out, but he leaves with a meaningful sneer. That night, as if guided by something, Miyako heads to the stables and begins to suck Kurosawa's penis...