I totally get what you are trying to do and as a short story, it's pretty much exactly how you've discribed you wanted it to be. I found myself almost forgetting the relationship between the characters during some of the story. It seems to me that there should be more guilt and indecision in the build up.
Although Amanda has guilty feelings, it seems like Mark has pretty much no problem going places that are completely taboo in most societies. Having said that, I felt it would be really difficult to convey more guilt than you did in a short story. Perhaps what you've written could be expanded into several chapters (if not a whole book?!) without being boring. There's plenty of material there already.
I think to fully explore this aspect, the reader needs to know more about Mark. Amanda's story is told in a well rounded way, but there is something lacking in Mark's character. I think this is due to the fact that it's a short story. This plot deserves more.
I can't say I liked it... but then I am not sure I would be a very good person if I did! It's a compliment on your writing style for me to say that!
In places the story is a little stilted, but again, I think that's due to the fact that the story needs more 'meat'.
I also found some of the colloquialism difficult to read for example:
"Ok," he said. "No problem. See ay later. Bye."
"That Mark?" I asked.
My husband hung up the phone and nodded. "Said he's gonna stay at school over break. Everyone is going somewhere at his job, so he told his boss he'd stick around to help pick up the slack for the week."
But that's probably due to my difficulty in reading dialogue, I prefer dialogue to be written in a standard format so I can apply my own accent to it in my head as I read. That's just a personal thing though.
Have you submitted other things? I'd like to read them.
I hope my comments help and well done for having the guts to attempt to work with such shocking material.
I like the story. It was really hot, so much that could almost forget that it was a mother and her son that were having these adventures. I don't know if that's what you were going for or not, but I got really hot reading about their adventures, especially the webcam one since it's so... personal to me.
