One day, a mother discovers her son washing his underwear in the kitchen and senses his sudden arousal, confronting him about it. Seeing her son's embarrassed crotch gradually harden, she gently strokes his sensitive area to calm him down. From that night on, strong feelings for her son begin to grow in her heart, and she starts tenderly pleasuring him every night. This warmth and sweetness leave a deep impression on her son's heart.