What is a family? What is an older sister? What is a sister? What is Mother? It exists for incest!!
I was attacked by my mother in the bath, I took my sister's virginity, I was made to serve my sister, and my cousin took my virginity ...!
The whole book is very satisfying with an incestuous relative, a harem development that is too enviable!
I will love and be loved and show the bonds of my family!

(Source: Comic Mujin, translated)