Firstly, people probably should not take characters of this author as if they were real close friends whose behavior you are criticizing - like the my teacher is my sex friend in which there are some really deplorable things and really questionable behaviors going on but it's darn funny, which is the point. Point is not to think what will happen to the relationship (or mental health) of the trio when the teacher fucks both mother and daughter.
I think some people take Pandacorya's manga too seriously. Pandacorya has a fetish for straight girls "falling" to lesbianism and it shows in pretty much all of their works, and in their 4-pages manga it's usually played for laughs. I don't like cheating and prostitution, but Pandacorya's manga are just too funny for me that's why I scanlate them.