Asp.net mvc username and password storage

[razor-rj]

I am creating an web application(Asp.net MVC). Instead of fetching the data from db's, we have been told to hit the external WCF service to get the data. However WCF service is configured to pass "UserName/Password"(ClientCredentials.UserName.UserName/Client, Credentials.UserName.Password) on every service request from the client(web application). In my web application there is a login screen where user passes his credentials and I am storing the username and password in SESSION variables, then for each action(WCF call) in the controller i am using the username and password stored in SESSION. I don't want to store the username/password in session?Is there any other storage available which is user specific for storing username/password?