Mouselook rotate around two axis.

I have made a mouselook script for First person but i can only rotate aroun y or x axis depending on what i have set in the inspector. What do i need to add or change in my script to make it work on both axis?

     public enum rotation_axis {
         mouse_x = 0 , mouse_y = 1
     }
         
     public rotation_axis rot_xy = rotation_axis.mouse_x | rotation_axis.mouse_y;
     
     // X-Axis
         
         public float sensitivity_x = 400;
         public float minimum_x = -360;
         public float maximum_x = 360;
         float rotation_x = 0;
         
     // Y -axis
         
         public float sensitivity_y = 400;
         public float minimum_y = -360;
         public float maximum_y = 360;
         float rotation_y = 0;
     
     // Rotation
     
     public Quaternion original_rotation;
     
     // Use this for initialization
     void Start () {
         original_rotation = transform.localRotation;
     }
     
     // Update is called once per frame
     void Update () {
         if(rot_xy == rotation_axis.mouse_x){
         
             rotation_x += Input.GetAxis("Mouse X") * sensitivity_x * Time.deltaTime;
             
             Quaternion x_quaternion = Quaternion.AngleAxis(rotation_x , Vector3.up);
             
             transform.localRotation = original_rotation * x_quaternion;
         }
         if(rot_xy == rotation_axis.mouse_y){
         
             rotation_y += Input.GetAxis("Mouse Y") * sensitivity_y * Time.fixedDeltaTime;
             
             Quaternion y_quaternion = Quaternion.AngleAxis(rotation_y , Vector3.right);
             
             transform.localRotation = original_rotation * y_quaternion;
         }
     }