ROE-528 — During a scorching hot summer vacation, I got my first girlfriend, and my aunt, saying "This is sex practice," relentlessly milked me dry with multiple loads in a pile-driving cowgirl position...

During a summer vacation marked by record-breaking heatwaves, Ryosuke tells his aunt Kotoha that he has his first girlfriend. However, Kotoha, who has been suffering from loneliness since her husband's death, loses her reason at his innocence. Stealing glances from her family, she gently seduces him, saying, "It's just practice for sex," but the pretense of instruction gradually falls away, transforming into a frenzied lust. On the final day, Kotoha restrains Ryosuke's hands and feet and indulges in ejaculation control, squeezing out his youthful virility to its limits. For seven days of depravity, Ryosuke has no way to resist his aunt's venomous fangs...