It's amazing how close your portrayal of Twilight's reaction to magic blockers and knowledge/power against them matches my head canon.

This chapter reminded me of how I used to clamp binder clips on my hands out of boredom while in class or working.

With a few tugs and magical adjustments, each length of twine formed a taut ‘V’ between the bindings on her front hooves, the pulley above, and the clamps below. Twilight gave her front hooves and experimental tug, and hissed in pain as it yanked the clips on her teats..

A tiny typo there. but other than that, Predicament Bondage is the best. So evily sexy and sexily evil.

Noteworthy. Quilbur Davenport. Roseluck. Lily. Carrot Cake and Cup Cake. Matilda. Mr Rich—”Please, call me Filthy,” he’d said to her as she said hello. Garnet. Thunderlane. Flitter. Pokey Pierce. Cheerilee.

Goodness. Ponyville's filled with kinky fuckers!

“Well, we’re in public, so no indecent exposure.

They're all naked. Wouldn't "no indecent acts" perhaps be a better turn of phrase?

Rarity pushed a hoof between Twilight’s legs, [...] sex and pain and Rarity and sex and Rarity—

Damn, she went fast. Unsurprising considering how worked up she must have already been.

She had learned that Thunderlane, young, athletic, effortlessly charming, had an arrangement of sorts with Carrot Cake, one which Cup Cake was quite content to watch.

Suddenly my crack shipping of Carrot Cake and (pegasus) Flash Sentry doesn't feel quite so cracky.

I notice you either forgot or choose not to to mention the magic blocker coming off at the end.

Over all, very engaging, very well written, very sexy.