Sara-chan, a small and underdeveloped girl, trains every day with her older brother in order to become an adult woman. In order to practice kissing, she stretches herself hard and kisses her older brother, and has her small breasts gently caressed to make them bigger. In addition, a pure sister Sara-chan who asks her to inject her brother's sperm into her unhaired pussy so that she can become an adult woman as soon as possible. Secret training with her older brother is repeated until her small wish comes true!
