Letting go

Just two scenes left to write. Two scenes.  I know exactly what's going to happen. So why is it taking so long to actually write all the words that are needed?

One theory is that I don't want the book to end. It's the third in a trilogy and I really like these characters. They've all been with me in one form or another for seventeen years.  The original idea came out of a conversation with a male friend who thought he knew everything.  Once the characters showed themselves they became as real to me as any imaginary friends. They're independent of my will. I know that sounds a little bit nuts but other writers feel the same way about their characters.

Another theory as to my delay in finishing these two scenes is the need to send them off in a really big way.  I keep trying to improve on the grandiosity of the final scene. That's in conflict with the tone of the story. Yes, there's magic. Yes, they're changing the world and curing cancer. But their personalities would dwell on the moment rather than the larger picture. They are intimate scenes about two characters and how their interaction affects each other.  Saving the world is the by-product.

Do you ever hold off finishing a story (reading or writing) because you're not quite ready to let the characters go off into the world without you?