Storing variables in a plugin
Declare a private variable inside your class, private $userId = NULL

After you've saved the user in the first method, update the variable $this-&gt;userId = $user-&gt;id

In the second method grab the user by using the variable $user = craft()-&gt;users-&gt;getUserById($this-&gt;userId);

I haven't actually tested the code, but it might do the trick :)

EDIT: You might want to make a null-check before attempting to fetch the user, to ensure that it doesn't break if it tries to run it while the variable is still NULL