Need object rotating with mouse position to finish rotation after mouse button release.

Hi,

Thanks in advance for help.

I've attached the code below to a cube. When I press the left mouse button and drag it the cube's rotation follows the mouse cursor. When I release the button the cube immediately stops. I am trying to find a way to have the cube finish its rotation, decelerating, after the button release rather than immediately stopping.

 {
     private int speed = 12;
     private float friction = .3f;
     private float lerpSpeed = 10.5f;
     private float xDeg;
     private float yDeg;
 
     private Quaternion fromRotation;
     private Quaternion toRotation;
     
     void Update () 
     {
         if(Input.GetMouseButton(0)) 
         {
             
             xDeg -= Input.GetAxis("Mouse X") * speed * friction;
             yDeg += Input.GetAxis("Mouse Y") * speed * friction;
             fromRotation = transform.rotation;
             toRotation = Quaternion.Euler(yDeg,xDeg,0);
 
             transform.rotation = Quaternion.Lerp(fromRotation,toRotation,Time.deltaTime  * lerpSpeed);
         }
     }
 }

Thanks again!