My favorite little sister was cheated on by a creepy man and turned into a female who was crazy about mating.

After his parents' death, his older brother desperately worked part-time to support his life, and his younger sister comforted him by playing sex. One day, while my brother was away, my uncle visited the house and attacked her younger sister Mikako. He is threatened with, "If you listen to what you're saying, no one has to struggle," and then he cums inside Mikako, who can't resist. After that, her uncle trains her to have sex with a female who is crazy about sex, and she orgasms through toys. The older brother has seen his younger sister's lewd behavior as he cums over and over again during intense sex...