Well, the best story porn often has a compelling narrative that keeps you engaged. It also might have well-developed characters that you can relate to or find interesting. And, of course, the level of sexual content might be just right for some people's tastes.
One way is through art. Artists can use paintings or sculptures to depict stories related to the female form, including the breasts in a tasteful and meaningful way. For example, ancient Greek sculptures of female figures often showed a harmonious and natural beauty, which can be seen as a form of 'play story' about the ideals of beauty at that time.
One possible reason could be hormonal imbalance. For example, if a man has an increase in estrogen levels relative to testosterone, it can lead to breast growth. This might be due to certain medical conditions like Klinefelter syndrome.
First, he should see a doctor. The doctor can do tests to find out the cause. If it's a hormonal imbalance, they can prescribe medications to correct it.
I think the 'May the Best Man Win' porn comic Sigma is of a vulgar and adult nature. It's not the kind of thing you'd want to come across unless you have a specific interest in such adult content.