Pick out the dirty bits, add some oohs and aahs. Only write the bit of the sentence that captures the imagination, i.e. If the sentence reads;
I'm coming into you in two seconds darling...as soon as I have finished applying this 'Preparation H to my Piles.
Just write the first bit (up to darling..)
Be careful of 'Mills and Boon' though.
couldn't you take each chapter and write a tiny summary, and then see what it looks like, and then make it sound exciting?
aren't there a million websites that tell you how to?
good luck with it - it sounds daunting
Seriously though, if it were me, I would have a look at some previous giant tomes (like W & P or some of Wilber Smith's or Michener's) and see how they did it.
Author Page at the 'Zon