In the era of the metaverse, flat chested sex dolls have become a key interface between the digital and physical worlds. Their simple physical features are easier to match with virtual images, and the built-in positioning sensors of life size sex dolls can capture motion data in real time and drive the virtual characters to move synchronously. This virtual-real fusion solution transforms the flat chest design into a technical advantage, reducing the user's cognitive sense of disharmony by 51%.