I remember an arresting image from a porn book I read many years ago. A young adult woman had been bound to a post (part of a gazebo I believe) in a garden by her younger step-sisters, who were wont to torment her in such ways. They had just bared her breasts and begun to tease her when an older man / love interest of the bound sister appeared in the garden. All loose sisters flee, but the man cannot resist approaching his bound love interest and (when she reproaches / refuses him verbally) he begins to “tickle” her breasts with stinging nettles he finds nearby. Her pleas grow increasingly frantic as his arousal builds and his sexual demands become more explicit…
For obvious reasons, these photos from Shadow Slaves have reminded me of the scene:
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From a 1932 edition of Nell In Bridewell:

“How many strokes?” asked Cunigund, in a quiet, zealous official tone.
“Until it is enough,” answered the governor harshly.
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A very nice combination of leather straps, tattoos, and a riding crop in this detail from a Device Bondage photo:
The lady with the tattoos is Kathryn Dupri.
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Often grabbing her panties like this is the best way to get her to hold still for a few swats. Although in Bethie’s case, she doesn’t reliably settle down until she hears the stitches start to pop and realizes her struggling is about to damage one of her favorite pairs of panties:

Pic is from House of Taboo.
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From an author interview:
Sue Lyndon: Celeste, tell us how you got started writing. Did you start out writing spanking fiction, or did you experiment with other genres first?
Celeste Jones: I’ve always been an avid reader with a secret desire to write books. Several years ago while having lunch with my mother she leaned across the table and said “Have you ever heard of spanking…you know, like in sex?” Once I recovered, she told me that she’d met a woman in a writing class who wrote domestic discipline stories. I contacted my mom’s friend and that’s how I got started.
Awkward!