No, not at all. A nine year old is still a little kid. He probably hasn't hit puberty yet. Think about it, you (most likely) have had sexual thoughts before, while he is innocent.

Do not get me wrong, my grandparents have a four year age gap, and they are the happiest couple in the world. However, at both you and his ages, four years is a massive difference. Watching a movie or going to church together is okay, engaging in anything more romantic than a hug could put you in a legally bad place.