If you haven't seen it already, His Captive Princess is out in audiobook format. I've got to tell you. I love the narrator's voice. Maxx Pinkins also narrated Bound to Favor and he hits the spot every time.
Listening to audiobooks is a real pleasure for me, especially since I can do other things while listening.
Just so you know, if you already bought the Amazon/kindle format for His Captive Princess, you can also get the audio from Amazon for a hugely discounted price (only £2.99 in the UK and whatever the equivalent is in $ for US). Better still, buy both at the same time (audio discount still applies) that way you can switch between listening and reading. Or do both at the same time.
Here are the links:
Audible US: http://ow.ly/mjoz50FxC0T
Audible UK: http://ow.ly/GoWA50FxC0R
Amazon US: http://ow.ly/nsrn50FxC0P
Amazon UK: http://ow.ly/EBmj50FxC0Q