Just use [ SPOILER] and then [ /SPOILER], but without that extra space. So, like this:
Originally Posted by ArtNJ
You know, I kind of felt an inkling of that, but I was so moved by what happened at the end that I had to understand what was going on so I kept reading. If it had stopped right then and there, I probably would have made up my own reasons as to why it made sense.
I liked the style of writing and the whole tragic love thing really got to me. Though, do be fair, you are right that unless there is more revealed about the world, that ending was a bit of a WTF? ending.