After a long-awaited family trip with his mother and cousin Eimi Fukada in tow—though they arrive ahead of schedule due to an unforeseen delay—Masao spends the entire day enjoying quality time with his older relative. Their fun takes an unexpected turn when Masao clumsily spills a drink onto his pants. Concerned about him catching a chill in the destination's climate or setting indoors too long in wet clothesiness,
Eimi swiftly guides him into a room to strip down. The moment she pulls down his trousers to check on him properly is met with utter surprise; Masao’s penis is revealed to be impressively large and rock-hardly erect! Realizing that leaving such magnificent hardware unattended for too long simply isn't an option after their hiatus from intimacy,
Eimi makes a bold, spontaneous decision: she decides *he* needs to pleasure *her*. The rest of the day becomes an intense celebration of closeness, as they remain pressed skin-to-skin, engaging in passionate lovemaking until Masao releases all his potent seed deep inside Eimi.