"Hey, virgin boy, want me to help you out?" My tough former delinquent sister-in-law always shows off her panties as if it's no big deal! She's so vulgar and sexy! She always makes fun of me and my virginity, but one day she found it amusing that I got excited seeing her panties and made a tempting offer! It turns out my super sensitive sister-in-law was also getting into it, and in the end, I lost my virginity to her! - Iori Nanase