Though it looks like an ordinary massage parlor from the outside, once inside, it transforms into an oil massage shop where real sex is possible. Y, who consistently ranks high in customer requests, possesses an incredible allure—especially her stunning big ass. Wearing a short skirt, she teasingly reveals the perfect silhouette of her sexy buttocks. She generously applies oil and carefully teases the customer's crotch, deliberately stopping just before climax, mastering the art of orgasm denial. This intense teasing eventually becomes unbearable for both parties, leading to unprotected penetration and finishing with a creampie. This raw, realistic session delivers the unique thrills only an underground brothel can offer—an immersive, clandestine experience.