Several aspects of this book were well done and unique. The disabled husband, Walfort, for example, was a complex character, and Heath refrained from drawing him as either a good guy or a bad guy. He remains very human, being flawed and often selfish, but not unlikable.
The two main characters were good to begin with, balking at Walfort's suggestion of producing an heir, and the emotions seemed real. The first sex scene was awkward as one might think, and the "day time" relationship between them for the most part was gradually built. That part was quite enjoyable to read. However, the physical relationship made me yawn simply because it was so incredible.
Other parts of the book were cliched and formulaic. The resolution wasn't romantic (as well as being unbelievable), and the epilogue settles everybody's life too perfectly.