Stepchildren, 12 years as a family. Parents are absent on their wedding anniversary trip... It's the first time it's just the two of them. Because Izuna's parents, who are strict with her upbringing, aren't around, she shortens her skirt and even does makeup she doesn't usually do... Was she always this womanly? She doesn't change out of her uniform, and her leg movements are bad, so her panties are completely visible... She even talks about love. I became aware of men and women and was masturbating in my room when I was spied on... "Big brother, please don't treat me like a child anymore." My head went blank with my little sister's temptation and I crossed the line...