Fuyufuku wa Ooku o Kakusu

The serious and meek class president is, in reality, secretly going out with a boy from her class... She's nervous about the things she says in fear of people around her finding out, and even when it's time for sex she will only willingly lift her long skirt up to her knees; that's how cautious she is. But that fearfulness only makes her boyfriend tease her, and for some reason she finds it thrilling! With delicate direction, Kikunosukemaru-sensei depicts a girl having the kind of daring hidden sex that runs counter to her meek appearance♪ (Source: )