njrick:
I love writing dialogue - developing characters, relationships, and plot through what the characters themselves say, making it believable (or at least believable within the "world" I've created for them, however much detached from reality).
I'm in agreement with this, I enjoy the challenge of conveying the characters' thoughts and feelings, even advancing the story's plot, via the dialogue which they engage in. Also, I try to include nonverbal reactions (shrugging, nodding, looking downcast, grinning, frowning, brows furrowing, etc.) which accompany what characters are saying, to further indicate their thought processes.
(I much prefer "Sheila's eyes flashed yellow fire at Nelson," to "Sheila was very angry with Nelson.")
Dialogue, and even occasional use of mentioning a character's direct thinking to him/herself, can also help make the description of the actual punishment more compelling, it seems to me. It's quite challenging to describe a spanking without becoming repetitious, however personal perspective can be of value in that attempt.
So yes, believable dialogue (whether or not the situation itself is credible) strikes me as one critical aspect of a story, spanking-oriented or otherwise...

--C.K.