She came to the beauty salon with her boyfriend. Her body gets hotter and hotter from the therapist's lewd massage, and she can't resist the massage that gets more and more erotic... The customer this time... She has only had sex with two people, including her previous boyfriend. Neither her current nor previous boyfriend are good at sex, but since she has nothing to compare it to, she thought, "I guess that's all there is to it...". Her boyfriend, who is being treated through the curtain, can't resist the female beautician's erotic techniques and gets super erect! He feels so much that he thinks he can't do it... but he tries to suppress his moans so that his partner next to him doesn't find out... The lovers get more and more excited. The couple who lost to the pleasure are finally cuckolded at the same time. In the end, the therapists and the couple enter into a foursome! This is the height of immoral eroticism! Couples who can't help but feel it even though their partners are next to them!