Will You Forgive Me If I Do Anal? Sara Tsukihi

Her husband pays her no attention, always busy with work. Sara drowns her growing loneliness in illicit acts with a man she met on SNS who calls himself 'Sensei'. But one day, she learns that her husband's love, which she thought had cooled, is still directed at her, and she tries to break up with 'Sensei'. ... However, 'Sensei' claims that anal sex is not cheating, and forcefully drags Sara into anal hell.