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18-year-old. The academy's honor student Serina, who boasts a deviation score of 70, has a secret she can't tell anyone. It's about doing naughty things with a middle-aged uncle between school and cram school. Serena-chan hits the stress of studying while getting sweaty and SEX with her uncle. It's too erotic. It's a desperate patch where you'll be pistoned over and over again, and the English words you've learned will fly away. Is this girl who is happy to have a lot of vaginal cum shot even though she loses everything when she gets pregnant? Or is it a sex genius...