Riko, a beautiful big-breasted girl with a pure and innocent aura, makes her appearance. A scene originally planned to be just kissing takes a sudden turn when she exclaims, "I'm sorry, I can't hold back anymore!" and swiftly flips the situation, pinning him down and taking him deep with raw penetration, climaxing intensely. Though shocked by the sudden shift, she gives in completely, captivating everyone with her exquisite expressions. Nana, a seemingly demure and gentle older sister type, actually harbors a deeply erotic side. Her subtle affection—often shown by trailing after someone she likes—occasionally reveals itself through teasing words: "Next time we meet, will you let me finish you all the way?" The handjob climax scene that follows is a must-see. The erotic charm of her role as a female teacher is simply irresistible. ※The girl's scene appearing in the latter half of the main feature is included as bonus footage for your enjoyment.