To fulfill the fantasy of men who desire to steal another man's wife, this installment of the NTR Hot Springs series targets a couple invited on a hot springs trip. This time, the target is "Mai," a petite, slender beauty with an adorable charm and captivating smile. Lured by her boyfriend to visit a hot spring, Mai is suddenly approached for an unexpected appearance on a hidden camera program. Unaware of the setup—approved by her boyfriend and arranged as a "memorial" event with compensation—she nervously begins her first-ever adult video shoot. While self-consciously changing into just a single bath towel as required by the production, she is secretly filmed. Her natural, unguarded expressions—filled with anxiety and tension before filming—radiate an authentic allure. To facilitate the cuckolding scenario, the crew fabricates a reason to place her in a mixed-gender bath, allowing the male performer to gradually approach her. Despite her nervousness during her debut shoot, Mai grows closer to the male co-star, eventually accepting continued mixed bathing in the private indoor bath after filming ends. She succumbs to his seduction, receiving affection and performing a blowjob, tasting another man's cock for the first time. Since a blowjob alone doesn't fulfill the client's request, the man asks for her contact info after the bath, but she refuses, saying, "I have a boyfriend..." Yet subtle cues suggest she isn't entirely opposed to him. Seizing the moment, he bluntly asks, "Let's have sex," and to everyone's surprise, she agrees. In a sex room located directly beneath the room where her boyfriend waits, the psychological torment intensifies with lines like, "Let's make sure your boyfriend hears your sexy moans." The thrill of her boyfriend being just upstairs drives her arousal as she performs a wet, slurping blowjob on the stranger's cock, coating it with saliva meant for her lover. While whispering that she's doing something wrong to her boyfriend, she craves the stranger's larger cock inside her pussy, sinking into pleasure. Relentless, sleazy verbal teasing—constantly reminding her of her boyfriend—confuses and overwhelms her, guiding her toward inescapable ecstasy. Her emotional conflict, torn between guilt and pleasure, is vividly portrayed, capturing the ultimate essence of eroticism.