The Second Season Of Kuroshitsuji Wasn't Canon. It was just for simple fun. Alois is a character but not a real character in it. Ciel did lose his memories but shortly remembered them.
FOR THE SEVENTEENTH TIME IT'S NOT CANON
CIEL DID NOT TURN INTO A DEMON
JIM MACKEN DID NOT EVEN TURN INTO A DEMON. I AM USING ALOIS'S REAL NAME. IT'S ANNOYING HOW PEOPLE CAN'T SEE THAT THE SEASON TWO ISN'T CANON.
If you don't know what I mean, canon simply means it didn't happen in anime.