Kazoku ~Haha to Shimai no Kyousei by 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.