humm... I'm certain this will have very serious repercussions on your work. You did apologized publicly, its a start in my opinion.
i'm concerned yes, but not so much as to leave. I will still be here, and so long as you keep you word that it was a huge mistake that will never happen again, I will stay.
also, I did read the doccument, but as far as my understand goes, this seems to be a "horny teenager meet willing aduld" situation, not to say that it is not a bad thing in itself, but i'm not so naive to believe that teens will stay away from adult content untill they are 18, I was once a teenager after all. Not to make a excuse for you, as you did know what you were doing, but if it is the case, I don't see it as an unforgivable thing.
ok, some edits: i did read the other documents and tweets, it is a "horny teenager meet willing aduld" situation over the internet.
Also, you wording is very different in the first document than the second one. I know what raw and emotional responses looks like, and that certainly was one. It was explained after in the second, but I don't see many problems with that particular thing.
so, i stand by what I said earlier, you did a mistake, apologized as better as you could. You will suffer consequences no doubt, but as far as i'm concerned, so long as you don't do it again I will be still here.
also, it was surprising to see the origins of your main character there, at least the name of him.