~ teacher's "pet"? ~

Age difference? It doesn't seem like it will be a problem. The relationship between teacher and student, ah, you mean fiancé? It also seems like a common secret. But, it's better if it's kept secret, right? After all, your life is not for public consumption that everyone should know about. Keeping it a secret until the right time is a fun challenge for both of you because it won't diminish your feelings either, right?