Not Safe For Work tag questions

Well, pink pajamas has probably run its course and I've managed to piss a few people off, but when don't I piss people off. I got a nice message saying how someone will never read anything I ever write and I think someone has a voodoo doll and has been stabbing my keyboard.

Anyway. I have a question about tags. This came up because of an older story ( http://bigclosetr.us/topshelf/fiction/31763/aunt-roes-last-d... )before the tag even existed. But, if I know a work is going to produce a negative emotional response (like crying, and yes, I knew people would cry over P.P.) should I mark it non-work safe. I was under the impression that the NSFW was a tag you put on erotic pieces and I would hate for people to think that Pink Pajamas was smut. I know I pull on the heart strings, that's why so many people have me on their ignore list, but how should I tag it. Should I put a big "This'll make you cry" tag on some work. Discuss.