You can solve your problem by lip augmentation. After lip augmentation, the lips will become plump and sexy, and the small mouth will look much bigger. The main method of fat enrichment is injection of hyaluronic acid, which is safe and has a short recovery period. It will make your lips plump immediately after finishing. It may swell just after finishing, and it will reduce the swelling by 80% in a day or so. The more natural it is, but hyaluronic acid will last for about half a year because it will be absorbed by itself.