Drifting Clouds(2010)

Kumosuke walks out on his pregnant lover, Fumiyo, and goes to see his old lover, Kiyoko. Even though Kiyoko's husband, Sachio and her sister, Hikaru think Kumosuke suspect, Kumosuke pretends to be Kiyoko's brother and stays in her house unconcernedly. One day, Kiyoko suffers from constipation and begs Kumosuke to suck out feces from her mouth. As Sachio gets jealous for being stolen his part of sucking his wife out, he does the same thing to Hikaru, which causes a collapse of the family. The meeting and parting of strange and sad people. Where the story heads to...