My younger sister Mia has recently become interested in sex and started trusting me completely, believing everything I say and obeying my every command. Every day, quietly but steadily, I'm teaching her various sexual acts and training her. She smiles and hugs me tightly, saying, "I love you so much, big brother," excited to find out what I'll teach her today. This is a secret story between a brother and sister, where I plan to use adult toys to deliver unprecedented pleasure to my sister's inexperienced body.