Brother to sister... incest female training [scene 2-1] Prison strap-on hook edition

Haru is a college student who moved to Tokyo to attend university. Haru is such a syscon that he followed his older sister (Chisato Hoshina, Queen) to Tokyo and enrolled in the same university. He once happened to watch an SM video in which his sister appeared, and learned her true nature. When he reunited with his sister for the first time in a while, he decided to take the plunge and say, ``I wanted to be trained like the masochist in the video.'' ``It seems like you're not popular, so why don't you just stop having men?'' As Mistress Hoshina tells him, even though she's a virgin and has never been in a relationship, she ends up losing her ass virginity to her sister's penis... Inbred female training where the body is carefully remodeled from the inside into a female.

[scene2-1] Strap-on sex over prison

“Haru, how do you feel in the prison?”
Queen Hoshina's voice echoes in the narrow and dark prison. Ever since she was raised as her older sister's official female ****, she has spent her days in cold iron bars waiting to be trained not by her older sister but by ``Queen Hoshina.'' It's as if I've been physically separated from my beloved sister by a cold, inorganic iron bar, and I can't help but feel lonely. The only fun I had during those days was the strap-on training I received from Hoshina once a day.
"Lick it like I taught you."
The best command you can receive from Hoshina-sama. She shamelessly and vulgarly sucks on the big penis that is held out in front of her.
The gap in my heart that has been filled with loneliness. Her ass has become loose due to daily strap-on training. Only Hoshina-sama can bury them. I want more, more...
In these lonely days, Haru savors the momentary happiness of living as Anna. I want to capture everything about Hoshina from my announcer... Anna, who had been completely stretched out by the daily strap-on training, began to desire even more pleasure.