Most Helpful Guy
He was simply expressing that he loves your boobs. If he's going to feel them, why not comment about how nice they are? Kind of like, if he puts his hands on your ass, and draws you to him, it's normal to say something like: "you have a nice, tight ass."
Most Helpful Girl
I think it's just something that comes out when they play with them, just like if we were admiring someone's outfit we would tell them