My friend's wife is a lewd private tutor

Takashi, who is unable to study, asks his colleague's wife, Riho, to become a private tutor, but Takashi is so concerned about the hearts of his beautiful private tutor, Riho, that he is unable to gather in his studies. Riho is embarrassed by Takashi's cuteness and momentum, but she removes her bra... Inspired by the obvious sexual desires of young men, Riho's private lessons develop into eloquent classes...!