SWEET LONELY SISTER

One day, my father suddenly remarried. My sister-in-law is Mai. Mai's mother was a useless mother who didn't do anything around the house and had been divorced many times. Mai was always having sex with her stepfather to keep her mother from getting divorced. Eventually, I will have sex with my father, but... Even though I had sex for my mother, I still loved my bright and cute sister-in-law, Mai.