Title: The Marriage Diaries
Author: Erika Wilde
Copyright: ebook 2014
Source: Amazon

published description: Erika Wilde turns up the heat in THE MARRIAGE DIARIES, a sensual series about a married couple who take intimacy and passion to the extreme. This full-length book includes the first four parts of The Marriage Diaries, and makes a complete novel.

THE MARRIAGE DIARIES Collection Includes:
The Awakening (Volume #1)
The Seduction (Volume #2)
The Taking (Volume #3)
The Temptation (Volume #4)

Freebie. Only two characters - 4 short books - fun that it was a married couple for once and certainly some hot scenes, not extremely deep on plot ;)