[Dynseli]

It's possible. Everyone has muscle covered by fat, and fat is what helps feed the muscle when its needed. The tissue stays there, it just converts into either fat or muscle depending on what the body needs. Eventually, if the muscle is not used, it will be turned in to fat, depending on how much muscle strength is not used; or total tissue lost or gained based on calories.

Everyone has a mix of fat and muscle, and they both exist together. It depends on calories and the type of exercise to base how the fat to muscle proportions are.