An Alternate Universe

Right after the war, Harry Potter is de-aged and sent to an alternate universe by someone who aspires to be the next Dark Lord. When he wakes up, his parents, Sirius and Remus are alive, Ian Potter is the apparent Boy-Who-Lived and he is Voldemort's most trusted Death Eater? Harry must find a way to get back to his original universe and not get caught by the Ministry.