Idea expanded from a quicksand/sticky restraint thread (>>9541545
). Let's see if it works.
Girls being held against their will by quicksand, sticky substances, giant snakes, tentacles, normal bondage, solid objects, etc. The more powerless the best. The less wiggle space the best.
Add-ons like rape, asphixia, sinking/drowning, constriction, etc are encouraged as long as they don't eclipse the restraint itself. No hypnosis ideally, as it takes away the fun of seeing the girl struggle.