Koko is a single mother struggling to support her child, so she secretly starts offering men's massage sessions from home. When a neighbor discovers her business, she reluctantly agrees to treat him. Beneath her modest appearance is a slender body with huge H-cup breasts. His harassment initially unsettles her, but with no one else to rely on, she gradually becomes dependent on him, opens her heart and legs, and grows addicted to sex until she finally begs him to creampie her.