Who is she?

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Her name is Tia Ling, from Infernal Restraints' -{Please and Thank You}

http://www.infernalrestraints.com/device/bondage/trailer.php?y=2010&p=01_22tia4&u=InfernalRestraints-Tia-Ling-Damon-Pierce-Please-and-Thank-You
(Note the Sybian in the background of the above link's main picture; that would be the Sybian she is sitting on in the above image.)

A little gallery of Tia, from this episode:

http://picsee.net/upload/2017-02-27/132968b30542.jpg

http://picsee.net/upload/2017-02-27/c64d38420827.jpg

http://picsee.net/upload/2017-02-27/468e07e42426.jpg

http://picsee.net/upload/2017-02-27/6b168932ac74.jpg

And here is a little gallery of Tia, from other episodes:

http://picsee.net/upload/2017-02-27/0e20c8e01fb4.jpg
http://picsee.net/upload/2017-02-27/cc91857d6466.jpg
http://picsee.net/upload/2017-02-27/0a925ab4d4b8.jpg

In the prior year (2009), other episodes from this series in which she appeared included:

The Price of Pleasure
http://www.infernalrestraints.com/device/bondage/trailer.php?y=2009&p=12_25tia3&u=InfernalRestraints-Tia-Ling-PD-The-Price-of-Pleasure

Don't Lie
http://www.infernalrestraints.com/device/bondage/trailer.php?y=2009&p=05_08tia&u=InfernalRestraints-Tia-Ling-PD-Dont-Lie

Stuck Duck
http://www.infernalrestraints.com/device/bondage/trailer.php?y=2009&p=07_17tia2&u=InfernalRestraints-Tia-Ling-PD-Stuck-Duck

Looks like in all of 2010, she returned only for the episode in question, and she was a no-show in all of 2011. If you'd like to check whether she came back in 2012 and afterwards, you may look at:
http://www.infernalrestraints.com/device/bondage/gallery.php?page=

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