I am a college student living with my older brother, and I am extremely obsessed with my sister, spending all day living in admiration that can only be stimulated by my sister's things. One day, my brother and Honami, who is about to get married, decided to live together. When I went crazy for Honami, who was more beautiful than I expected and had a stunning figure, she smiled and said: 'It's like you have a little brother!'... little sister? That's right, marrying my brother means she is my sister! I couldn't contain my excitement at having the 'big sister' of my dreams. However, the other person is my brother's girlfriend, so I tried to restrain myself, but after taking a shower, Honami started to stretch and flaunt her big butt, even Amatsu asked for my help. I couldn't resist seeing my sister's huge butt right in front of me...