FRIENDS UPGRADE by Stephanie Williams
Buy or publisher link: http://www.phaze.com/book.php?title=Friends+Upgrade
After ten years of being very best friends, Doug and Judith’s feelings for each other become less than platonic. But due to their past experience, seeing others mix sex and friendship together, neither one of them want to take the first step.
Doug finally has enough of hiding his feelings and sets up a romantic vacation unbeknown to Judith. It nearly blows up in his face, but a porno movie comes to the rescue.
Can they upgrade their friendship without getting hurt again?