Not sure about books specifically, but I'd suggest you just look over at /lit/ and find something you're into.
Also some other tips based on my own experience both reading and writing a whole bunch of stuff (part of which you may already be familiar with depending on your experience):
* No, unless you turn out to be an absolute fucking master at descriptions, good style/language is not gonna make up for bad anatomy. Obviously these are stories for entertainment purposes, so some degree of artistic license is fine, but I highly advise against approaching the whole thing with this mindset. (Depending on your specific subject) Just a couple of minutes on wikipedia or so will suffice to give you a general idea about most types of injury/death so you can avoid the more egregious mistakes.
* I find that for (guro) erotica description trumps over narrative. Sure, some framework plot/setup or characterisation is nice too, but the detailed descriptions of the action and the character's feelings in that moment are the main draw, imo. Unless there's something very specific long-form you wanna write, I recommend sticking with short stories (as in, the literary genre, not the word count).
* Closely related, those descriptions. You want to be detailed/accurate, yet (relatively) concise. Avoid describing one single thing with half a dozen adjectives; instead describe several relevant things (if applicable) more briefly; to that end pay attention to all senses or surroundings. Try not to overly repeat yourself, but don't be afraid of sometimes reusing the same word a few paragraphs later; better that than to desperately search for new synonyms and end up with a bunch of rare/arcane adjectives that just scream 'thesaurus'. Honestly, good descriptions are probably one of the trickiest parts if you ask me, and this one really is probably better learned by reading a bunch of examples.
* Choice of words. This is a pretty big one in erotica (and may actually be worse in books rather than stories posted online), do NOT use dumb euphemisms to refer to sex or genitalia, it's never anything but cringey. You're still writing a story about people fucking, so just say that they're 'fucking'. And while you don't have to be as vulgar as you can (which is why I personally hardly ever use the word 'cunt') be to the point describing those things. A guy has a dick, cock or penis, not a 'member', 'organ' (which one, his pancreas?) or 'manhood' (though this latter one may get a pass if the whole story is written in a kinda archaic style, perhaps). Similarly it's pussy, cunt or (sometimes) vagina, not 'folds', 'depths', 'womanhood', etc. Also note that the language you write in should be language your PoV character(s) use. So if one of them would actually speak/think in those euphemisms, you have somewhat of an excuse, but don't overdo it. And if the character would be completely blunt about it, then so should your writing.
* This one should be obvious (and will be if you've done any real writing before), but you'd be surprised. Use fucking spellcheck. Keep your tenses consistent through the whole story. Use paragraphs both for dialogue and to break up huge blocks of text. Re-read the whole story, slowly, to catch any other mistakes; or better yet, get someone else to proofread it for you. Spelling/grammar errors or just an unreadable style/layout will turn people away before they even give the content any chance, regardless of how good it might have been.

Hope some of this is helpful, feel free to ask if you wanna know anything more/specific.