Considering sexyblimp on youtube I can't make adequate impression from few minutes but it looks like this voice is a bit too young for reading stories in narration mode and it does not look extremely professional in comparison to other audio stories read by professionals.
But overall it is not bad.

With that voice I woud suggest reading manga's or comics because it is great for character speech and there is far more room for acting too (Probably that twill be too much work on editing while it will be less reading )

At least you could do some short test and see how it works.

As for audio porn stories I do not think this is that useful because main benefit of audio story is that it allows you to do multitasking you can listen while doing something else what saves lots of time
In case of porn this is not that good because you are not going to do any work while listening and it feels somewhat strange when eyes have nothing to do.
If you try to watch unrelated pictures it messes up comprehension of the story.

But of course this is only my opinion, and I a not likely to pay for anything like that anyway.