Reading isn’t sinful in of itself.
There are parents who read teen novels that have explicit material to preview it before deciding if their kid should read it/to equip themselves for talking about it to their kid on why they shouldn’t or if they do.
If you chose the material purposefully to be titillated, then that’s another matter. i am no theologian, but that’s my interpretation.
But maybe after reading it, you can suggest to the teachers or whoever decides these things that there are other books with similar themes that can be read in its place for the next group of kids. What happened to the classics?