Quote by Jen
You are ordered to
Yes, Mistress. I live only to serve your pleasure.

A few months ago, my then-boyfriend (now husband) was out of state, working. A friend and sometimes lover came over to keep me company, the only drawback was that her (OF AGE) little brother was visiting from the west coast. In a hurry, before they arrived, I swept up my massive sex-toy collection and stowed them all in my "writing studio", which is actually our guest bedroom.
I totally forgot that I had plopped them all on my desk, in plain sight, until I opened the door after they decided to sleep over. I was at first mortified, but then kind of turned on, as he definitely saw them. I think he "examined" them because they sure looked moved around after they left.
I may be in the minority, but penis size isn't really an issue. Reversing the question will illustrate my point. Do you prefer ladies to be hairy, trimmed, or shaved? Should her lips be innies or splayed out like butterfly wings? If she rocks your world and gives you the best sex, ever, do you care?
I've had lovers that were very well-hung that didn't do a thing for me and others that were meagerly endowed that got me off so often and so hot that I passed out.
My vote was Girth, although length & girth are my preference.
But, the poll doesn't have any options for the real criteria. Is the cock attached to a decent man that makes me feel? Regardless of length, girth, or angle of incline, can the guy use it well enough to satisfy me? A nice, big, thick cock is nice, but meaningless if he he doesn't know how to, or is unable, to drive me insane.
We're all learning. Anyone that claims otherwise is just stagnating.
For new writers (and I'm fairly new myself) my best suggestion is to write what you want, how you want, and please yourself, first. If you don't like it, don't expect anyone else to, either. such things as length, episodic or not, flow, personal writing style, etc can all be worked out as you write, practice and grow in both skill and confidence. Such integral things as proper grammar and punctuation can be learned.
I'd say write your story as you envision it and whether or not you need to break it up will reveal itself to you in the process. Whatever happens, though, keep writing.
What Whia said, plus this:
The longer the story, the fewer readers you'll get. If you're writing for accolades, then definitely break it up into succinct chapters where each section has its own plot arc and steamy action. If it's one, long event then a longer story would be the way to go.
I write lots of mini-series, and they're a double-edged sword. The more chapters one writes, the lesser the response your ensuing chapters receive.
My best advice is to write it how you envision it...follow your heart (as my husband always says). For me, if the story is well-written, flows smoothly, and is both hot and gets me emotionally invested in the characters, I'll read and love it if it's 100 words or an X-rated War and Peace.
I'm with Sandra on this, with a bit more personal enthusiasm. It's not something I plan for, crave, or touch myself thinking about, but if somebody wants to lick it out of me, I'm a people-pleaser. Of course, having it licked off of me, or out of me, by somebody other than the donor is always hot.
I'm mostly not into the pain aspects, myself, but your points resonate with me. While the feelings of soft ropes against me, being bound, or being shackled by cold, hard steel and chained are sensual and erotic, the psychological feelings (your second point) are what does it for me.
Being bound and helpless takes away all your control and ability to reciprocate, leaving you with the ability to do nothing except receive. If you trust the person and they know how to stimulate your mind and body, in tandem, masterfully, the entire universe goes away and you just become a vessel to receive pleasure. You willingly give yourself to them, so you may receive sexual delight.
For me, sometimes a series is intentional, sometimes not. If I have a long, more detailed story in mind, I assume that it will be a series because I'll need to give my audience (both readers) plenty of room to absorb the details without being overwhelmed. Sometimes, I have a single story in mind that could be a stand-alone but is just easier to digest if I break it into two or three smaller parts.