How can I call methods on a tied variable

package Link;

sub FETCH {
    my $this = shift;
    return $this->{"site"};
}

sub STORE {
    my ($self,$site) = @_;
    $self->{"site"}   = $site;
}

sub print_method {
    my $self = shift;
    print $self->{"site"};
}

sub TIESCALAR {
    my $class = shift;
    my $link  = shift;
    my $this  = {};
    bless($this,$class);
    $this->{"site"} = $link;
    return $this;
}

1;

use Link;

tie my $var,"Link","http://somesite.com";
$var->print_method;

my $secret_object = tie my($normal_scalar), 'Tie::Class', @args;
$secret_object->print_method;

my $secret_object = tied $normal_scalar;

package Link;

use strict;
use Carp;

use overload
(
  '""'      => sub { shift->site },
   fallback => 1,
);

sub new
{
  my $class = shift;

  my $self = bless {}, $class;

  if(@_)
  {
    if(@_ == 1)
    {
      $self->{'site'} = shift;
    }
    else { croak "$class->new() expects a single URL argument" }
  }

  return $self;
}

sub site
{
  my $self = shift;
  $self->{'site'} = shift  if(@_);
  return $self->{'site'};
}

sub print_method
{
  my $self = shift;
  print $self->site, "n";
}

1;

use Link;

my $link = Link->new('http://somesite.com');

print $link, "n";   # http://somesite.com
$link->print_method; # http://somesite.com

package LinkTie;

use strict;
use Link;

sub FETCH
{
  my $this = shift;
  return $this->{'link'};
}

sub STORE
{
  my($self, $site) = @_;
  $self->{'link'}->site($site);
  return $site;
}

# XXX: You could generalize this delegation with Class::Delegation or similar
sub print_method
{
  my $self = shift;
  print $self->{'link'}->print_method;
}

sub TIESCALAR
{
  my $class = shift;
  my $self = bless {}, $class;
  $self->{'link'} = Link->new(@_);
  return $self;
}

1;

tie my $link,'LinkTie','http://somesite.com';
print $link, "n";   # http://somesite.com
$link->print_method; # http://somesite.com

$link = 'http://othersite.com';

print $link, "n";   # http://othersite.com
$link->print_method; # http://othersite.com