I think you are actually asking about "in"? It refers to "into the embrace". That's implied by the word "hug".

going is used here to describe the future rather than/or perhaps as well as a physical movement of the author came is used here to describe the movement of the puncher. Using Came here is a little odd but perfectly ok. "n" however probably means "and" if you want to use 'n' or an' in this way you need to punctuate. Given that AND is only 3 letters long I'm not sure you benefit by reducing it, unlike say 'phone for telephone.

Hi Nobody! The verb "To come" is used from the point of view of the speaker to express the movement from another place to where the speaker is. if you give to a person the order "Come (here)!" , that order means "Move from where you are to where I am." if you give the order "Go (there)", that order means "Move from where you are now to another place (but not to where I am now)" So the verb "To go" means moving to a place where the speaker is not placed. I hope it helps. ^_^

In my opinion, ' be going to' is near future tense, we use 'be going to' to describe something will happen soon and " come" is just a saying that means you want to do that but you don't know when it happens. Maybe my answer is not completely correct, I hope someone will fix it for me :)