The guy is lucky with his sister - she is a nipple. She's ready to open her mouth for him to stick it in her. Apparently she serves him regularly, because he no longer feels affection for her, but fucks her like a street whore - rough and bold. However, she seems to like this treatment.
It's certainly easier for female students in terms of exams. It is not often that female teachers can take advantage of male students for the same purpose, but male teachers are not squeamish about it. Girls are good, they know what they want to achieve in life and pursue these goals, in spite of the bans and public opinion. I wondered if I should have chosen a different profession...