The Maya family runs a massage parlor, and their daughter and son-in-law, who had left home after getting married, have come home. Maya and her husband are happy that their house has suddenly become more lively, and welcome them with smiles. Orie tries to massage her son-in-law to relieve him of his fatigue from his long journey, but he has injured his hand, so her mother-in-law, Orie, gives him the massage. Orie massages him gently, but she notices a large bulge in his crotch. Orie, who has not been satisfied with her sex life with her husband recently, can't help but think dirty thoughts. Late at night, Orie wakes up and goes to the bathroom. Her son-in-law is quietly stroking his crotch. Orie is startled by the milky liquid that is released from her husband's larger penis, and quickly returns to the bedroom. The next day, her husband and daughter go out, and Orie is bored, so she tries to call out to her son-in-law for tea, but he is taking a nap. When she approaches him to cover him with a blanket, she notices his slightly bulging crotch. Just thinking about what she saw yesterday made her heart pound, but she couldn't take her eyes off him and ended up touching him. Orie gradually became unable to hold back, and her mischief accelerated until she found herself stuffing her son-in-law's big cock into her mouth and receiving the milky, hot liquid in her mouth...