Add AJAX to form that was loaded through AJAX
You need to provide Drupal.attachBehaviors with the context (what was added) and the Drupal.settings. You should also use context in your script, so the JS should be rewritten something like this (not tested)

(function ($) {

  Drupal.behaviors.aforms = {
    attach: function(context, settings) {
      $('body', context).on("click", "#load-me-up", function() {
        $('#target-container').load('/aforms/article', function() {
          Drupal.attachBehaviors($(this), settings);
        });
      });
    }
  }

})(jQuery);


You need to use context on the $('body') to avoid the handle to be attached multiple times.
In the load callback you need to add $('#target-container') to attachBehaviors, but in this case $(this) should be the same thing.