Yup. Song of Saya is pretty great as far as horror stories go. It's also very nauseating.
I've had 2 Crowning moments of Awesome in fiction so far, one of them being when Harry Dresden fights his way through red court vampires with Susan. The other was in a book called Achaja, but since it's a polish book nobody here will know it, so it doesn't really matter.
Getting erections from hot prose isn't very difficult. I mean we have a NSFW section here and everything. On the other hand there's also the NTR and Rape and that almost never fails to evoke bad feels in me.
Speaking of bad feels I own a book that's not fiction, in fact it's an autobiography that's in essence a huge bad trip from the beginning to the end.
It starts with a girl whose parents were drug addicts. Then she gets adopted by a christian nutcase. The girl is starved and has to steal money for food to stay alive. For every little bad thing she's punished, and the description of torture is always very elaborate. Sometimes she's forced to choke on a chair leg, sometimes her feat are beaten with a wooden stick in a way that's incredibly painful, but leaves no trace, sometimes she's forced to eat soap, or other detergents (because of this book I don't find the threat of washing someone's tongue with soap funny at all, but rather horrifying).
At some point a dog enters the household and when he shits in the house the girl is forced to eat it. There was also a thing where to avoid suspiction because the girl is so thin she's forced to eat lard. The diet isn't changed from a piece of bread every now and then but instead, lard. I know from experience that eating a little bit too much fat is unpleasant, so eating lard to put on weight had to be horrible.
Of course the girl gets out of that abusive environment at some point, otherwise there would be no book, but guess what? Just as she gets out she gets roofied and raped. Then she meets a guy that's a complete scumbag who gets her pregnant. Really the only nice thing that happens in the book is that the girl finally manages to put the christian nutcase on trial.
The fact that this was an autobiography and not a piece of fiction had to be the biggest downer for me. Hey, at least if I want to write a torture scene or child abuse at some point in the future I've got realistic reference materials.