These four girls are Sai's sisters in the fanfic "Kitsune Child".
Oichi- with the long brown-hair, she is the oldest. She goes to college.
Mai- with the short blue-hair, she is the second oldest. She is a senior in high school. She's smart but mostly lazy.
Himiko and Ayane- one's with the same hair color, the youngest. They are fraternal twins. They go to junior high and they are very sweet.
Full Credit:
Original: [link]
Oichi- with the long brown-hair, she is the oldest. She goes to college.
Mai- with the short blue-hair, she is the second oldest. She is a senior in high school. She's smart but mostly lazy.
Himiko and Ayane- one's with the same hair color, the youngest. They are fraternal twins. They go to junior high and they are very sweet.
Full Credit:
Original: [link]
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I saw this on her profile