The editorial department receives submissions from various enthusiasts. All of them are compelling, but in this work, we have recorded posts from a brother and sister who have formed a taboo relationship. My sister has an exemplary background, excelled in studies and sports from a young age, went to an all-girls school, one of the best preparatory schools in the area, and got married after a workplace romance at the company she worked for after graduating from university. My brother had trouble with his classmates when he was in school, dropped out of school while not going to school, and still lives with his parents at his parents' house. It is the so-called "hikikomori". The two entered into a sexual relationship, which also developed into an SM relationship. My brother is making my sister a slave, but there was a time when my sister blamed my brother. It is a forbidden record of brother and sister SM who devour each other's desires in the blood that does not separate.