Can you spare me from the asshole? (Tsukiko Sara ATID-542)

Sara, feeling lonely because her husband only works and doesn't do housework, met a man online called "Teacher" and used immoral behavior to relieve her loneliness. But one day, she realized that her seemingly indifferent husband's love hadn't changed, so she wanted to break up with "Teacher"... But "Teacher" said that anal sex doesn't count as infidelity, and then forcibly dragged Sara to anal sex hell...