Imagine: A Hot Wife Story

Alina and Tom enjoy a happy marriage and a satisfying sex life. When a friend's upcoming birthday sends them to an adult store for a gag gift, they stumble upon a strap-on sex toy better than any of the toys they have at home. They buy it for themselves, only remembering the birthday gift at the last minute on the way out.
The right moment to use it is slow in coming. Time passes and the toy sits unused, almost forgotten. At last Tom decides tonight is the night and surprises Ally in a dark bedroom. She has no idea he is wearing the strap-on and assumes he feels bigger because they share an awkward position.
The larger size does wonders for her, powering a strong reaction, giving them a night of sex like no other. Even after she learns the truth, her delight with the prosthetic remains high. Tom is spellbound by his wife's response and wonders what she's thinking as she closes her eyes, soon discovering there is a man at work who fuels her fantasies. Instead of the jealous anger another husband would feel, Tom is mesmerized by the idea. He finds imagining his wife in such a situation wildly exciting.
Determined to take things farther, he gives Alina permission to explore her yearnings in the real world, and she does, indulging briefly with her colleague, but her emotions for the man prove too passionate, her desires too strong. She'd hoped for something casual but found so much more. Afraid of what she felt, she backed off.
Alina and Tom retreat to the safety of their bedroom and their wonderful toy and complex fantasy life, but Tom is determined to share her, and share her with a man equal to their toy. They begin to visit a local club, exploring entirely new aspects of their shared sex life.
Everything is well and good but something nags Tom: the man Ally truly wants is the one man she avoids. He devises a strategy to bring the two together, despite his wife's misgivings, and succeeds, but soon finds himself scrambling to recover, driven to desperate measures to regain what he's lost. Rated '5/5 - Explicit and plentiful' for steam/spice/heat level.