You were, in fact, discussing sexual content. It might not have been intercourse, but it was still sexual content.

And the fact remains that it was brought up to the entire student body. Including our incoming first-years. I know at least a few students were worried about having their parents taking their journals away. We don't know what's happened at this point. It might have happened.

Mr. Kishitani is in trouble for pressuring some students to reply even though they were clearly uncomfortable. Repeatedly asking why it's a big deal to someone counts as harassing them.