During summer vacation, I went back to my parents' house for the first time in a while and took a nap, and before I knew it, my nieces had also come home. I've been taking care of my nieces since they were little, and while I wasn't looking, they've grown up little by little, both physically and Kokoro, and they flashed their tanned, developing breasts and thighs in front of me. When I was peeking at them, they noticed and asked me, "Uncle... do you like boobs...?", seducing me with their small, delicate bodies...