Kazoku ~Haha to Shimai no Kyousei~ (Bishop)

My sister Sasa. My sister, Natsu summer. Mother Otoha.
The protagonist who has three family members who are not connected with blood by remarried father.
Although the relationship is good, all the new families are beautiful women,
The protagonist was worried that they would be in close proximity as a family.
I see my sister, my sister, my mother as a woman, not a family, and I am eager to find my desire every day.One day, when I went to the room of my father who was leaving home alone,
The protagonist who burns anger when he encounters with his cheating partner.
Can I keep my desires while I’m away from home, even though I have been patient at home?
I am desperately restraining myself so as not to reveal my desire for my family.
If my father leaves his family and overtakes other women,
I swear that I will make this family my own.That night, the hero who saw his mother napping in the living room was mischievously driven by the desire he wanted.
Then the main character who enjoyed her mother’s fascinating body was witnessed by her sister.