HTPK-001 My younger sister's obedience: The older brother who became a livestock, Miki, Miki Sunohara

Miki-chan, who has grown up to be an adult, has an older brother who is a hopelessly naughty ronin who is always lurking in the house and spying on her masturbating or bringing her boyfriend in for sex. One day, my brother sneaks into my sister's room and tries to have sex with her at night, but she finds out, and from that day on, he becomes her sister's slave, and as per his daily routine, he cunts her like a butter dog.