try this if i am not wrong in understanding your question
$('.description h3').each(function () {
$(this).prependTo($(this).closest('.caption').find(".title"));
this code will work if description
is part of caption. your markup is not clear
and if it is not part of caption then try this
$('.description h3').each(function () {
$(this).prependTo($(this).closest('.description').siblings(".title"));