The sons are always bothered by the fact that their mother-in-law, Kana, doesn't wear a bra at home. After their father's remarriage, the brothers, who secretly wanted to get along well with the beautiful and kind Kana, continued to have a somewhat awkward relationship. The stalemate between mother and sons broke when Kana noticed the intense gazes of her stepsons fixated on her chest. '...Are you interested?' Not wanting to argue with her stepsons, Kana, on the condition that it's just a little, exposed her breasts in front of them and proposed they could touch them freely. 'Are you sure?' The sons swallowed nervously. At this point, Kana still didn't fully understand how much interest and sexual desire her sons had in her body...
