By the time she thought "This might be bad...", she was already caught in a vortex of pleasure she couldn't escape. Yukari, who was suffering from severe shoulder stiffness due to her big breasts, visited a chiropractic clinic. But when she received the treatment, her body reacted sensitively and she became horny. By the time she realized the therapist's plan, it was already too late. She was fucked helplessly before the overwhelming technique. Yukari is stunned. But what came to her mind at that moment was the feeling that she wanted to do it more.