Can my 14yo son be charged with dissemination of obscene materials?

One of my son's classmates has written a piece of fiction containing graphic descriptions of sexual conduct between two students and a teacher' once again, entirely fictional writing here. It was texted to my son, who thought it funny to forward the text to one more classmate and show it to several more on his phone. The parents of the girl who was one of the "character" in the piece wants charges brought against all involved. The resource officer said this could include 'dissemination of pornography,' 'distribution of pornography,' and 'exploitation of a minor.' Based on a cursory reading of the South Carolina statutes, it seems there would need to be pictures or visual representations in order for charges involving child pornography or exploitation to be brought. It seems this could fit the definition of distribution of obscene materials, but I'm wondering how this charge could possibly be levied when "50 Shades" is sitting in nearly every bookstore in the state? Thoughts?