http://ultradevi.tumblr.com/post/120376521452/justine-here-high-drama-here-the-captive-with I'm written a fair amount here about the submissive's experience -- referred to as "subspace" -- a heightened sense of reality when you're supposedly captive and about to be punished*. You can find yourself in a virtual trance, indulging your most freaky fantasies -- while, down deep, knowing you need only use your "safe word" to get your trusted dominant to stop and release you.
You can really see it in this girl's eyes. Ooooh, so cool a place!
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* The "punishment" -- a spanking or whatever -- is the key, even if it's not delivered. And, thence, the magical importance of being "naughty" in sexual scenes' "bad" girls have all the fun!