Continuation of the sexual adventures of the brother and his cousin from the studio "gomasen(3D)". The second part of the story was released exactly six years after the first part "Sex Lesson for Brother" of 2011. 

The little sister continues to love her brother and read a huge number of books. One day, the brother finds unusually lewd reading material in her room. After reading the lion's share of what was written, he became very aroused and went looking for his lewd little sister.