Kokoro Asano, who looks pure on the outside but is a total pervert on the inside, takes on the challenge of developing her portio for the first time in her life. The erogenous zone hidden deep inside her vagina is developed carefully with a big dick and a massager. The development progresses slowly, and she is unable to hide her excitement at the unknown pleasure. She is developed, teased, and suddenly made to cum mercilessly...she reaches a climax several levels higher than she has ever experienced before. Don't miss the sight of her lustful appearance as she goes beyond climax and enters a trance state where her mind is filled with pleasure! She's already addicted to the big dick...