Cynthia tells Mark about her encounter with Vanessa

On the Uber ride back home, Mark is distracted enough by his own phone that Cynthia feels comfortable opening iCock and heading to the section of the app which contains the preset options - Sissydick, Human Dildo (which made the affected cock rock hard and the man attached totally unconcerned with his own pleasure), Prejac options 1 and 2 (both made the affected cock develop premature ejaculation and caused it to become aroused by the humiliation the condition caused, but option 2 made the guy consciously fetishize and enjoy his PE while option 1 didn't), the Exhibitionist settings, the list went on. Finally, she found the preset she was looking for: Cuck option 1, which caused the affected guy to become extremely turned on by the thought or knowledge of his partner's infidelity and by the shame it caused him. When she'd first looked through the presets, Cynthia hadn't paid much attention to the Cuck option. Prejac 2 had seemed much more promising for her specific ****. Now, though, the perfect situation has arisen to try it out. She pushes the button, and the option for personalizing the preset appear. The stamina level is sufficiently lowered by default, so she doesn't feel the need to mess with it too much for now, but she does raise semen production, wanting to see how big the load he'd shot earlier that day was.

When they get back to the house, Mark heads off to get changed into house clothes, while relaying things he'd heard from various friends at the party.
"Chrissy and Joel say they're thinking of building a pool, but knowing Joel, I have doubts that it'll actually happen," he tells her as she enters the bedroom. She sits on the bed.
"Mark, I need to tell you something," she says. He stops as he's about to take off his board shorts.
"What is it?" he asks. She pats the bed beside her and he sits down.
"Promise you won't be mad," she says, playing more nervous than she is.
"Uh, okay? I promise," he says cautiously. She takes a deep breath and stares at the floor as she begins to speak.
"When I went to make sure Vanessa was okay back at the party, Vanessa wanted me to get into bed with her. I thought she just wanted to cuddle, but she started telling me about how the guy she's been seeing hasn't been satisfying her, and how sexually frustrated she's been as a result," she feels Mark grow tense beside her, although it's hard to know whether it's due to the shame of his failures being echoed back to him or due to the fact that his mistress has been talking about her sex life to his wife. She goes on.
"She was saying all this stuff, and we were in bed together, and she was naked and I was in my bathing suit, and she kind of started... coming on to me? No, that's not right. It was more... well, she told me how much she needed to cum and made it clear that she wanted me to help her out," she explains. She blushes, thinking about how easily she'd been sucked into it, and how eager she'd been to please.
"So... yeah. Vanessa and I had sex. But it meant nothing!" she adds quickly, "She was just so **** because of what's been going on with this guy, and she said that she can't orgasm from masturbating, and I just felt so sorry for her, especially since I kind of know where she's coming from, you know?"
She looks up at Mark, who's staring at her. She can't help that notice that he's hard.
"You and Vanessa had sex?" he asks disbelievingly.
"Yes. Please don't be too mad," she replies.
"Why would I be mad?" he asks.
"What?"
"I mean, it's not like you had sex with a guy or anything," he says, "It's not proper cheating. You told me that you and Vanessa used to make out in college, and I never had any problem with that, remember?" Cynthia nods, smiling.
"When I told you, you said it was hot," she recalls, "You joked that we should do it again sometime while you watched." Man, I really missed a lot of signs that Mark might be attracted to Vanessa, Cynthia cringes.

She leans in and kisses her husband before looking down at his bulge.
"I take it you still think it's hot?" she asks. He grins.
"Maybe," he says, "What did the two of you do, anyway?"
"Oh, it wasn't that exciting," she says, "It was like masturbating, but with her clit instead of mine. It's not like we scissored or anything."
"Did she do anything for you?" he asks.
"No! Like I said, I was just helping a friend to get some relief," she says, "Although..."
"Although what?" he prompts eagerly.
"I did get wet. Like, really wet," she admits, blushing, "I was behind her, reaching around to her clit, and I started kind of humping her as though I had a dick and was fucking her. It was so weird, I just started doing it. But she seemed to really like it, because she started moaning. I seriously thought that someone was going to overhear and walk in."
"I wish I'd overheard," Mark says, "I would've loved to see that." Cynthia grins as she has an idea.
"Get naked and lie down, I'll show you what I was doing to her," she says. He takes off his board shorts and she directs him to lay down on his left side with his head on one of the pillows. She whips off her sundress and positions herself behind him, with her left hand planted on his pec, her leg around his thigh, and her right hand reaching around to his cock, which is hard and dripping precum. She lets out a little laugh.
"This feels so weird," she says. She licks her fingers and begins to rub his dick with two digits.
"What are you doing?" he asks.
"I'm rubbing your dick the way I rubbed her clit," she explains, "Man, that guy of hers must have really been a disaster in bed, because it wasn't long before she was moaning." Mark stifles a grunt.
"Her pussy was so wet," Cynthia breathes as she begins to thrust her hips against Mark's ass, "and she was so sensitive and needy. I almost wished I had a dick, so that I could know what it felt like to be inside of her, fucking her and making her cum." Mark gasps and lets out a little whimper, not like any sound she'd heard him make before. She realizes that this is the first time in all the years they've been together that he's been in such a submissive role during sex - he's not fucking her, his cock isn't in her mouth or her pussy. Instead, she's rubbing his cock with two fingers like a clit, telling him about how she was able to please Vanessa when he'd repeatedly failed to do so. I could get used to this, Vanessa thinks.

It's clear that part of Mark is trying to hold back, not wanting to embarrass himself by giving in to the urges which the Cuck setting has drawn up inside him. He's obviously already fighting back the urge to cum. Cynthia realizes that he's been cucked twice over - both by Vanessa and by herself - and wonders if this may be making him feel the effects of the preset more than if Cynthia had slept with someone he wasn't fucking.

Wanting to keep this going for a bit longer, and sensing that Mark is almost ready to burst, Cynthia draws her hand back from his cock, planting it on his thigh instead.
"Why did you stop?" Mark's body writhes, anxious for her touch.
"Because I don't want you to cum yet," she tells him, laughter in her voice, "We've only been going about a minute. It took Van way longer to get as close as you are now." Mark exhales deeply, trying to calm himself down as the humiliation goes straight to his cock. She reaches up to his chest, so that now both of her hands are planted on his pecs.
"Before I started fingering her, I was kind of nervous," her fingers trace circles around his hard nipples, "So we lay like this for ages, with me playing with her tits the way I'm playing with yours."
Despite the lack of stimulation to his dick, pressure is clearly still building in his body, with the app-increased load in his balls only growing more **** for release. He reaches for his dick, but Cynthia bats his hand away.
"I'm showing you what I did with Vanessa right now," she says, "and she didn't touch herself. She just got hornier and hornier until I let her cum, and you're going to have to do the same." Mark whines, his hips bucking forward as his cock seeks any stimulation, but Cynthia wraps her leg harder around him, holding him back as she plays with his tits. He lets out a high-pitched moan, making Cynthia giggle.
"You kind of sound like her," she tells him, "with those needy little moans."
"Please, baby," he pants, his voice wavering, "I need you to touch me. Please touch me."
"She begged me to touch her, too. Just like you're begging me now," Cynthia tells him, her smiling lips grazing against his ear, "Are you begging me to touch your clit, Vanessa?"
"Yes," he gasps urgently, "Please touch my clit."

She takes her time moving her hand from his chest to his crotch, running her fingers along his hips and down his thigh. Peeking over his shoulder, she can see that his cock is drooling precum onto his belly and the bed. Her hand grazes back and forth along his inner thigh before gently handling his balls. She doesn't know if it's her imagination, but she feels like his balls are bigger than usual, heavy and bloated with an unnaturally large load. He lets out a moan as she manipulates them in her hand, feeling the way they move as she plays with them. His his breaths grow rapid and frantic as she moves her hand, and she feels his balls draw up tight against his body. She snatches back her hand at the point where his orgasm is inevitable.
"Ah!" He cries out in pleasure and his cock throbs wildly as jets of cum burst from its tip. Spurt after spurt of cum shoots forth, landing on the pillows, the bed, and on Mark. Some even manages to hit him on the face. Cynthia watches on in wonder as the most cum she's ever seen emerges from her husband's cock, first in bursts, then in pulsing waves. She grabs his dick and jerks it, getting her hand coated in his load as she milks it out of him, making him moan and whimper as she squeezes the last drops from his overstimulated member. She slowly ceases her strokes as he comes down, the same way she'd done with Vanessa earlier that evening.
"Holy shit," Mark pants as he begins to regain his composure. Cynthia lets out a laugh.
"That was unexpected," she says, "I guess you really liked that, huh?"