Riri and Kawamura have been in love for a while, both working at the same company. Riri's boss has always had his eye on her, using his lecherous gaze to scrutinize every detail of her body without hiding anything. Due to a mistake made by Kawamura, the despicable boss will accompany her on this business trip while Kawamura stays behind to resolve the trouble he caused. However, upon arrival, she realizes that Kawamura accidentally booked a double room instead of two separate rooms. She tries to find alternative accommodations, but everywhere is fully booked. Nevertheless, the priority now is work, so she puts this matter aside. After finishing the work, the partners invite her and the boss to celebrate with drinks. She signals for him to decline, but he intentionally ignores her and agrees, even trying to pour her drinks until she becomes intoxicated. After taking her to the room, he immediately unleashes his perverted desires on her, forcing her to have sex with him. Although she initially resists, the pleasure he brings gradually conquers her. She forgets about work, her boyfriend, and focuses all her attention on his big cock, engaging in passionate sex with him all night and into the next few days...