ASP.NET MVC 5 create global variable from current user email

Question

My current site uses two databases, one that stores the users directly and another one that stores additional data using the user email. I need to extract data (an identification number) from this other table, so I have created a model that operates like this:

ZivoyAccount.cs

namespace ZivoyPublicaciones.Models
{
    public class ZivoyAccount
    {
        //Database for additional data
        private PPublicEntities db = new PPublicEntities();
        //Database with user roles
        private zivoypostEntities userdb = new zivoypostEntities();
        public Int64 UserIdentification { 
            get {
                //Get the User Identity
                String UserIdentity = HttpContext.Current.User.Identity.GetUserId();
                var UserData = userdb.AspNetUsers.Find(UserIdentity);
                //Get the User Email
                var UserEmail = UserData.Email;
                //Get the Data from Other Database
                var ZivoyUserData = db.Users.Find(UserEmail);
                return ZivoyUserData.user_gkey;
            } 
        }
    }
}

But I have been reading that this isn't the right behaviour since this variables get set for all users, and I need them to be set for each user. How could I accomplish this?

I'm calling my model on a father controller so that I can use this variable on all my child controller

AuthorizationController.cs

namespace ZivoyPublicaciones.Controllers
{
    [Authorize]
    public class AuthorizationController : Controller
    {
        protected ZivoyAccount UserProfiler = new ZivoyAccount();
    }
}