Aoi sends a letter to her older brother, pouring out her feelings, and reunites with him during his home visit. After three years of silently nurturing her emotions, she longs to confess the truth in her heart. With innocent sincerity, she declares, "I've always loved you, big brother!" Her pure and earnest affection deeply moves him. Devoted to him in every way, she expresses her love through tender care and selfless devotion. Touched by her warmth, he finds himself falling for her as well. Their forbidden love grows stronger each time their bodies unite. As pleasure gradually awakens within her, they repeatedly indulge in creampie after creampie, binding their hearts ever more tightly together. This is a deeply moving erotic story depicting a sister's innocent love, a brother's tenderness, and the forbidden passion they share.