The content is about the sister-in-law who is deprived of sex, because her husband is quite weak and weak, unable to help her be satisfied. And one day, her brother-in-law's couple came home to play, witnessing the scene of her brother-in-law fucking her brother-in-law every day, making Ai Sayama extremely lustful, she had to masturbate.
And then the opportunity came when her brother-in-law had gone out for a walk with her mother-in-law, Sayama stayed at home trying to seduce her brother-in-law...