Adjusting accessibility:
Open Settings and then access
General > Accessibility > Speech
Once you are there, change to Speak Screen by swiping it using your fingers from the top area of the iPhone/iPad screen. This will help Siri read all texts displayed.
Turn auto lock off temporarily
Access Settings > General > Auto-Lock
Ensure that auto-lock is turned to Never mode. Do not forget to turn the Auto-Lock function on again when you are not reading an ebook.
Select a book of your choice
Once you have followed the above steps, make sure you pick a book and open it over iBooks or Kindle. Swipe like described above to start Siri reading. Siri will actually start to read anything visible there as well as flip pages when done.
Now then, do not expect a well-paused and expressive read-out-loud session from Siri. However, the monotone is decent and easy-to-get-used-to once you get into the groove.
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