Twist her devotion to being faithful.

"Craig and Erica, can you give us a moment?" you say, after a few seconds of deliberation. "I think Amy just needs a little time to cool off. I'll talk to her, Craig. You always appreciate how well I've been able to talk with Amy about her personal issues."

"Yeah, definitely man." says Craig, nodded emphatically. "You've always been so good at helping her with her problems. Take all the time you need."

Craig looks at Amy with an apologetic expression. "I know you're upset Amy, but I love you, okay? I'll leave you and John to talk for a little."

"I love you too, Craig." responds Amy. "I'll just be a minute. John's always been able to help me out with my issues."

You smile inwardly. Though you and Craig had always been good friends, Craig and Amy had always kept their own issues between themselves. Apparently your statement to Craig has further reinforced Amy's own perceptions of how you fit into their relationship. Not only is she more willing to discuss her relationship issues with Craig with you, but now you appear to be the go-to person for advice.

"Why don't you and Erica wait in the car?" you suggest. "Great idea." Craig says, opening the driver's side door and getting in. You give a small smile to Erica as she gets in the car as well, a smile which she returns with a wink. You're fairly sure she'll find *something* exciting to discuss with Craig while they're alone.

You turn to Amy, who's still obviously a bit upset. "Now, Amy," you say, with a sympathetic expression on your face, "I know you're upset with the idea of Craig ever being possibly tempted enough to cheat on you. But don't you remember what you confided in me the other day?"

"No, I don't," says Amy, looking at you with a puzzled expression on her face. "What did I say, exactly?"

"Well, you told me how much the thought of cheating secretly turns you on." you say, speaking in a hushed tone as if you're revealing something really embarrassing. Which of course, you are. Even if it wasn't true a second ago. "You told me that how much you care about being faithful makes the idea of breaking that rule so much hotter. When you think about being unfaithful in your marriage, it's enough to get you wet."

"I know," Amy says, blushing darkly and averting her eyes. "I really don't want Craig to be unfaithful, and...I've never thought of myself as an unfaithful person. But I get so tempted. The idea of inviting someone over while Craig's at work...letting him have his way with me...it just gets me so turned on. Especially when it's you I'm thinking of." Amy says, biting her lip. "I can't count the number of times that's been a fantasy."

"Yeah, I'm sure you've gotten yourself off pretty hard thinking of cheating on Craig with me, haven't you?" you muse, appreciating how you've inadvertently inserted yourself into her prime masturbation fantasies. "And not just me. After all, you've been thinking about how hot cheating on him would be since you two became a couple. You told me how you'd get off constantly when Craig wasn't home, or when he was asleep, thinking about the attractive men you could have cheated on him with that day. Whether they're young, old, or complete strangers, you've always found yourself fantasizing about them."

Amy's only response is to blush even harder, deliberately avoiding your eyes. Though the very model of a faithful wife a few seconds before, Amy's mind was now filled with fantasies of cheating on Craig, and memories of countless times she'd gotten off thinking of opportunities she had. The waiter whose bulge she had admired, the man at the bar she'd wanted to pull into a bathroom stall and ride, the cute high school boy next door she'd been oh so tempted to invite inside and get down on her knees for...

"You know it's wrong," you continue, "But the idea turns you on more than anything else. You love your husband, but all the time you've been together, even during sex, you've cum the hardest when you secretly fantasise that you're fucking someone else. So I guess you can't really blame your husband if he ogles someone else every now and then, can you?"

You saw Amy's expression change as new memories filled her head. That even though she loved her husband and was very attracted to him, no orgasm had ever been as good with as it was when she pretended that he was in the other room rather than inside her. That the man she was making passionate love to was someone she had just met, or a friend from work, or that married man she always had thought was rather handsome...compared to her dirty secret fantasies, Craig taking a few peeks at Erica paled in comparison.

"It's been eating me up with guilt." Amy confesses, looking away. "I know they're just fantasies, but one day I worry I'll cross the line. I could never hurt Craig like that. It would devastate him if he knew."

"That's why I think today is your lucky day, Amy." you say, as you nod your head sympathetically.

"How so?" Amy says, looking at you with a quizzical expression.

"Well, as we agreed, today you won't be Craig's, remember? Erica won't be my slut, she'll be Craig's. And you won't be Craig's wife, in terms of how you have to act. You'll be mine. And as your partner, I get to decide what is and isn't appropriate for you to do, don't I?"

Excitement and hopeful anticipation gleamed in Amy's eyes. "Wow...you're right. That's something...you'd let me explore?"

"Of course!" you say, smiling. "I did say that today would be a day you could both get all your urges out of your system, didn't I? And I know you've had that particular urge for a very long time."

"Wow." Amy says, thinking of the possibilities. "But...we didn't really discuss this with Craig. The deal was only that you and me would be able to do anything we wanted, and since you and Craig are swapping places, it's not really cheating, either. That's why it's okay." Amy says, confidently.

You grin involuntarily at how Amy's logic has twisted to accommodate your suggestions. Even now, as she prepares to be another man's partner for a day, she still thinks that what she's doing is faithful and right.

"You're right," you begin. "We didn't discuss this with Craig. But I think the idea turns you on so much that you don't really want to discuss it with him, doesn't it? You don't really want to give him a chance to shoot it down. And...it's not like you'd really be doing anything wrong. He agreed that you'd be my partner for the day, right? And as your partner, I get to make the rules."

Amy nods, embarrassed, but obviously too eager to explore her biggest fetish. One that up until a minute ago, never had crossed her mind. "You're only my partner for the rest of the day, though." she says, trying to tamp down on her excitement. "What are the chances that I'll be able to live any of my fantasies? It's not like a porn movie, where I can just seduce the pizza boy or something." she says, rolling her eyes. "And you know, even though it technically wouldn't be cheating, a day with you is the reason I agreed to do this swap in the first place, after all..."

"Oh, don't you worry about that." you say, with a wicked smile on your face. "Lately, I've found that I can be pretty persuasive when it comes to creating opportunities for others. Just know that you'll have plenty of chances. And still have plenty of time for me as well."

Amy nods, accepting your words, staring thoughtfully as she contemplates the day to come.

But," you continue, wanting to keep a little bit of the delicious wrongness of the situation in Amy's mind, "You know that it'll probably hurt Craig and cause problems if he sees you doing anything with anyone else but me. And even though you know I'm your partner once we get to brunch, and I get to make the rules, you still feel that it's a little wrong. But the wrongness of it just makes you so much more excited. You still worry about hurting him, and you're still intensely embarrassed of revealing this fetish of yours to him. So you'll just have to keep anything you do, with anyone else but me, completely secret. Make sense?"

Amy nods, still a bit ashamed of her desires, and the feeling of hiding something from Craig. But she is definitely excited. And no longer upset, now that she has so much that she's looking forward to. But what to do now? You know that you could easily set up a few entertaining situations for Amy at brunch. Given her new inclinations, it might be fun to watch and see what she does. Or, perhaps you want to "tweak" her views a little more? What if she found Craig cheating on her as hot as she found the idea of cheating on him? You take a couple of seconds to mull over the possibilities...