I am honestly a little overwhelmed by both the number and the length and quality of the replies, so I have parsed them into sections to make them easier to overlook and interspersed some comments:
*1. Does the story take on a life of its own, and do you feel an attachment to your characters:*
Seegee:
does a story/character ever take on a life of its own? All the time. That may be because I don’t use an outline. I have an idea, work on it internally and then start to write. I tend to let characters and story do their own thing and see where it ends up.
stevenr:
Do I get attached to characters from my stories, you bet I do. I created those characters, some are composites of people I've known. I have several, and I do mean, several stories that center around Principal Sandy Smith, and teachers Jenny Russell, Lynn Roberts. They all have bits and pieces of teachers and Principals I knew decades ago in the public school system I went to. When I write about them, it's almost like reacquainting myself with old friends.
stevenr:
I start with a basic idea, or plot line, and basically let the story tell itself, and the story will tell itself, it helps that I have a somewhat off beat imagination. This means that sometimes a story I think will be relatively short, may end up being a 10 story series before I complete the tale. In other words, they took on a life of their own
Goodgulf:
Yes, the characters often take a life of their own. Even with an outline there will be characters who don't want to follow the plan. Once they hit a certain level, it's a choice of following the plan or being true to that character.
kanestrokes:
Yes you will become attached to the characters, they are your creation. I had to draw serial (When Mary met Margaret) to a close, I did it through Margaret's death. It was easy writing the final chapter, but each time I proof read it, reading the chapter got harder emotionally. I wrote it, I knew what was going to happen but it still made for difficult reading. It is difficult to walk away from the characters after the serial has ended.
kanestrokes:
I keep a note pad to jot down ideas as I get them. I know roughly how I want the character to develop, but it doesn't always workout that way. A serial I've just finished, it's not been published yet, started as a single story, then came a new idea. Another character and then a second new character, I ended with a six part serial.
Geoffrey:
1 Almost always. I start with a concept, knowing roughly what will happen. Then I start developing the characters and the location. Once that is done the characters take over, behaving as such characters would in such circumstances, they "come alive" at least for me. From that point on I just need to nudge them to keep the story on track.
Once that has happened, I do, of course develop an attachment for them, unless the character depicted is truly unpleasant.
6switch:
I have been experiencing the same phenomenon as I try my hand at writing spanking stories, and find it extremely enjoyable as the story essentially begins writing itself through my hands. The plot starts heading in different directions than I had planned or even envisioned. The characters begin to exhibit traits that are unexpected and twists and turns emerge to send the story sailing on a different tack entirely. I find it compelling and very entertaining, sometimes to the point of spending more time writing than I should, at the expense of other things that need to be taken care of!
kdpierre:
In my case my attachment to my characters sort of precedes their creation since nearly every single character is based partially, substantially, or entirely on people I know, including myself.
Capstan:
Do my characters develop a life of their own, of course, they do. My first piece 'The Alicia Chronicles' is still only 80% complete, and at present runs to 345 pages, but I have started to post it in bite sized chunks as Alicia and Peter's loving relationship develops from their first meeting through an eventful reunion to a planned end on their return from honeymoon 18 months later.
opb:
Yes, I get attached to my characters, so much so that they get walk on parts in other characters' stories. There is even an avatar of the author who shows up. This is important because much of my early work was about exploring the nature of the relationship between characters and authors, so much so that the stories would probably have come on the wrong side of KDP's 'is it a spanking story?' criterion.
Do the characters drive the plot? Yes again. Often the story has started with a single thought, sometimes as little as a pun, and the story forms around it.
I find that journey of exploration interesting, I know it's all come out of my own mind, but it feels like it was there to be discovered rather than invented.
Well, I'm glad to see I'm not the only one who has had these things happen, and I appreciate reading about your experiences.
Kanestrokes, I can understand your feelings regarding killing off a character. If you change your mind, you could consider some kind of Reichenbach falls type retcon!

My own main character is 18, and the story is probably set around 2008, so conceivably I could spend the next many years following her until the present day. Hopefully, my innate laziness will keep this from happening.
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*2. What is a spanking story, and what makes it enjoyable? Is it a tool, a piece of literature, or something in between?*
Seegee:
As for what is a spanking story? It can be whatever you want it to be. They’re. It bounded by genre or anything else, really. I guess for me, anyway,some part of the story needs to involve spanking in one form or another.
Goodgulf:
I see two sorts of spanking stories. Stories about spankings and stories that have spanking in them. I'm not sure which is better.
Geoffrey:
2 For me a good spanking story is both arousing and interesting. I like to think that I could remove the spankings from some of my stories and they would still be interesting. I may be kidding myself.
To be interesting there needs to good background, people and place/situation. But readers wanting to be aroused may be turned off by lengthy, but necessary, scene setting and characterisation. So that bit should always be interspersed by references to spankings past or future, to keep them interested.
The spankings themselves should be well described and interesting. I also like some insight into the characters' feelings leading up to, during, and after the event.
Personally, I like to end on a high note--something amusing or foretelling future activities.
3 As I have observed the story needs to be arousing but that bit should be set in a piece of literature that you enjoy for its artistic qualities. I believe however that there are LSF readers who are only interested in the "good bits" and only spend a minute or so finding and reading them, rather than reading the whole piece.
The way you have phrased this resonates with me a lot, Geoffrey. I think I can say this is what I have been trying to do. But I feel I may have went a little overboard with my description of feelings and background. More about this below.
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6switch:
I think that a good spanking story should be a good story at its base, with the spanking woven into the fabric of the story in whatever aspect the author would like to portray. It is a piece of literature, regardless of its emphasis or topic. Spanking happens to be a great vehicle for me to share my point of view with the world, and hopefully, it resonates with others on whatever level it may and enriches the readers' lives!
TheEnglishMaster:
And to entertain, it must hold our attention from start to finish with characters, setting and a plot that captivate and transport us. It must avoid unnecessary details, or readers will be scrolling down for the hot bits, and never mind who, where, how or why. It must also avoid the kind of implausibility that spoils whatever illusion it has set out to create.
I can see what you mean, and you make me a little worried that readers may find some of the details a little too boring. Interestingly, the whole background and detail thing came about out of my desire to make the whole scenario more plausible. But like I said, I may have gone overboard. More below.
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kdpierre:
I can't think of any novel length works I consider to be 'good' spanking stories. Most are just sequential spankings scenes linked together over the course of time with little else going on, and the ones that have tried to have a nobler goal often come across as preachy. I prefer a concise, tight, clever, stand-alone story that touches on something integral, poignant, or just artfully or emotionally evocative of what it means to have this predilection. Say it, say it well, and move on.
That's entirely fair!
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Capstan:
As far as whether a spanking story is a story devoted entirely to spanking or a story that includes spanking; the answer is that it can be either. Some readers will wish to read exclusively the former or only the spanking parts of the latter and skip the rest. Some will also only read a particular type of story e.g. M/F or school stories which may not appeal to others. the great thing about LSF is that there is a huge repository of tales to suit every taste and more than enough readers to find your audience.
That's true.
Like I said in an earlier post, as a reader I do tend to search for stories that fit with what I like - e.g. "wanting to be spanked" type stories, and after a first readthrough I will concentrate on the "good" bits.
But longer narratives can draw me in with their prose or the themes they explore. And after having dabbled in writing myself I will definitely try look more actively for such stories.
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*3. Advice, story length, etc.*
Hotspur:
Not the length of story that we usually see on here but you could submit the finished article to LSF Publications. If it's acceptable, they might consider it publishing it as a full-length novel. Alternatively, it could be trimmed and turned into a serial.
Capstan:
My longest single series posted here is in twelve parts and totals 107 pages so your 30 or more pages can easily be adapted into a series. If interest is maintained readers to whom the work appeals will stick with you. You can however expect your readership to drop to possibly as little as a fifth by the end of a longish serial as readers will of course have their individual preferences.
Seegee:
With your length issue. You could try finding certain end points or breaks and post it in chunks. We’ve had a few full length novels published here like that.
Capstan:
Your experience very much mirrors my own. I started purely writing for my own amusement. I read spanking stories for amusement and at one point decided to submit a short excerpt to the site concerned as a thank-you for all the enjoyment that I received from the works of other authors.
After some encouragement and editing, the story was accepted and I then moved on from there. Later it was suggested that I look at LSF and with much support and encouragement I have been hugely content here as both an avid reader and as an author.
The rules for authors here are clear and whilst there is, of course, a quality threshold; the team here is invariably kind and supportive in getting works over the line.
That is very encouraging!
My thought was to divide it into parts and upload the first one and see if it could get through the eye of the needle, as it were. Then, if there were any interest in it, I could upload more. But the question is if it will fit in here. More below.
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TheEnglishMaster:
As many of us know, the eagle-eyed Library Staff have remarkable laser-vision for spotting Other Genres that try to sneak their way onto Our Hallowed Shelves with a token bolt-on spanking, when really such stories belong Elsewhere!
Okay, that is fair. See my next post for my thoughts on this.
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TheEnglishMaster:
Consider this: latest estimates from the LSF Archivists suggest that over half a million wives, 415,000 schoolgirls, 328,000 husbands and 176,000 boys and girls have now been spanked in these shelves with 624,000 hands, 412,000 paddles, 369,000 canes, 197,000 hairbrushes and one wet fish,
Are those actual statistics? That is impressive! I am particularly interested in learning more about the wet fish! Do you know what story that is from?
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kdpierre:
My advice if you use your stories as wank-fodder.....which is fine......is to enjoy them, get your jollies, and then..... post orgasm....... reread it and ask yourself if it's still good. If it only works as a 'tool', others may like it and even praise it, but it won't be for me. Like I said though, I'm a minority voice.
Nothing wrong with being a minority voice.

Interestingly, I'm not sure if I could use the story like this. I don't know if this is because I am too close to it, or if there are simply not enough "good" bits in it. More below.
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Capstan:
My advice, therefore, is to write what you would like to read, let your characters and your story develop naturally, and when you are ready and provided it is within the site rules, have no hesitation in submitting it.
A series does not have to be submitted all at once and additional parts can be added over time (you can add parts with up to a year between them) so that readers can get a taste, the readership here is exceptional in providing helpful and supporting comments.
In summary, please follow your instincts. I really look forward to hearing about the young lady's African adventures and further works in due course. Best of Luck!!
That is very encouraging, and thank you for your nice words!

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Geoffrey:
Astrosmurf, if your fiction is as good as your post, I expect that your stories will be worth reading!
Thank you, Geoffrey, that is very kind of you!!

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Thanks again for your replies! More to follow!