I have a story idea, but it might be more interesting as an exchange of E-Mails among two or three people. Here is the setting: Husband and wife have been married for six or seven years. Like most married couples, each of them occasionally fantasizes, but they are both rather shy and conservative, so they never even discuss their fantasies, let alone think about making them real. Husband has been notified that he is going overseas for a year- either a civilian job or a military deployment. He worries about his wife being alone- they don't have a lot of friends. He does know that she is friends with a woman who works in the same medical complex- they work in different doctors' offices, but get together for lunch often, and they have a common interest in photography. He encourages his wife to spend more time with this friend while he is gone. Significantly, he doesn't ask about the friend's husband, and their interests as a couple.
What isn't revealed at first is that her friend is very bisexual, and her husband loves to help her with the seduction of innocent new women. As they slowly, lovingly and gently lead the wife along the path to female/female sex, with husband watching, and later photographing, the wife writes to her husband about these friends, and describes the developing relationship to him. He is taken aback- startled, sort of jealous, but also turned on- and the feeling of helplessness isn't all unpleasant to him, either.
What isn't revealed at first is that her friend is very bisexual, and her husband loves to help her with the seduction of innocent new women. As they slowly, lovingly and gently lead the wife along the path to female/female sex, with husband watching, and later photographing, the wife writes to her husband about these friends, and describes the developing relationship to him. He is taken aback- startled, sort of jealous, but also turned on- and the feeling of helplessness isn't all unpleasant to him, either.