He was bragging about this day all week so that not even his own students remember

Angry, he came home and reproached you for forgetting his birthday "I expected it from everyone but you!"

Seeing your hands with a red bow, he smiled and seemed to understand "Ah, I understand, you are my gift" He said with a mischievous smile, carrying you in his arms. Just at that moment, everyone came out of their hiding places accompanied by a 'Happy birthday!'