The sons can't help but wonder about their stepmother Kana, who is always without a bra at home. After their father remarried, the brothers secretly wanted to become friends with the beautiful and kind Kana, but their relationship remained somewhat awkward. The moment Kana noticed the abnormally passionate gazes of her step-sons staring at her breasts, the stalemate between mother and son came to an end. "Are you interested?" Kana, not wanting to get into a fight with her step-sons, suggests that they expose their breasts to her sons and let them touch them freely, on the condition that they only do it for a little while. "Are you sure?" the sons swallow their saliva. At this point, Kana...