Mei is an H-cup big-tits girl whose charm lies in her quiet and gentle personality. She's having an affair with her senior coworker and has a habit of meeting him after work. That day, they meet for dinner as usual, and as they drink alcohol, the atmosphere gradually shifts. Letting her guard down more than usual, she approaches her senior with a cheerful attitude. As the alcohol kicks in, things take a sexy turn. Their after-work hotel conversation soon becomes erotic. When the senior's wife suddenly calls, Mei grows jealous but passionately kisses him to keep the mood going. Drunk and overwhelmed with passion, the two grow even closer. During sex, Mei excitedly shouts, "Yeah! Drink, drink, drink!" as she's intensely taken by her senior. Their fiery relationship heightens their mutual desire. Her senior, acting more lewd than usual, thoroughly enjoys Mei's huge breasts. Their bond deepens further, making them forget the very word "affair."