To attend university in Tokyo, the nephew begins temporarily staying at his aunt Reo's place. She has a bold and uninhibited personality, showing no restraint or consideration for her nephew's feelings. Her carefree attitude leaves him flustered, yet Reo seems to enjoy his reactions. Whispering in his ear, she teasingly says with a smile, "You don't have to be so nervous," gradually chipping away at his resolve. Adding to her words, she presses her big tits tightly against his back, deepening the seduction. His resistance slowly fades until it vanishes completely. Pleased by his innocent response, Reo pushes their relationship even further.