Hitotsu Kurai Morattemo

My name is Chifuyu, and I have an older twin sister named Chinatsu who's good at both studies and sports. My older sis has everything that I've always wanted. For example.. Haru-kun, the junior whom I've always loved, among other things. One day, I ended up helping Haru study, substituting for my sister. It started with an incident where he unexpectedly got an erection, that I learned that he and my sister haven't had sex yet. So, they haven't done it yet.. In that case, then I will.. I did things like suck his dick while making an indecent face and lick his nipples while riding him in the cowgirl position. Just one thing. I can at least have his first time. Right, sis? Daikon Arimura-sensei, a new writer of "Reverse NTR" stories, presents a sex story of a girl squeezing the virginity out of her sister's boyfriend☆ (Source:.