[HUNTA-565] Thanks to my sister, I'm having erotic things with my sister's colleague every day. A sister who absolutely obeys the orders of her hikikomori brother. A brother who doesn't want to go out, but has more sexual desire than anyone else. Under the orders of such a brother, my sister was sent to rent AV, and in the end, she even took care of him by handjob or fellatio. The brother's demands are becoming more and more extreme...