Cynthia stays home from work

"Mark is at Vanessa's place. Should I stay and watch or come over now?" reads the message on Cynthia's phone screen. She ponders the question for a moment.
"Stay. Actually, could you call me? I want a blow-by-blow."
"Sure, just give me a moment."
Cynthia sips her coffee as she eagerly awaits Roussard's call. Mark hadn't questioned her choice to stay home that day - after all, she'd laid the groundwork that she was feeling ill last night. Roussard had been posted near Vanessa's house in case Mark stopped by before work, as he evidently did sometimes. Clearly, this was the right choice.

Remembering Roussard's idea that the Exhibitionist setting might make Mark easier to spy on, she opens iCock and activates the kink. Seeing Roussard's cock appear as an option, it occurs to her that when he's spying on Mark, Roussard will usually be close enough to the secret phone she uses to control Mark that she can control Roussard's cock as well. That might be fun, she thinks to herself. Her phone rings, and she answers to Roussard.
"Not to jinx anything, but we may be the luckiest people in the world," Roussard says, skipping greetings, "I thought I was going to have to pretend to fix a power line, but there's a big unfinished building right across the road from Vanessa's. The whole front of her bedroom is window, and there's a big glass door between the living room and the balcony, so if they choose either of those rooms, I should be able to see pretty clearly. I reckon it won't be hard to see if they fuck in the kitchen, either. This is a one-bedroom, right?"
"Yeah."
"In that case, I think the only real blind spot is the bathroom. Providing they don't close the curtains, of course."
"Right. I turned on the exhibitionist kink for Mark, just in case it'll discourage them from closing the curtains," she informs him. Roussard whistles.
"You might not have needed to. It didn't even seem to cross their minds," he says.
"They're fucking already?"
"I wouldn't say that... Vanessa's naked, but Mark's still fully clothed. She's rubbing him through his pants. They're in the bedroom."
"Huh," Cynthia snorts, "Maybe I should make him jizz in his pants."
"Not today," says Roussard quickly, "He'd have to come home to get changed." Cynthia understands what Roussard means - having Mark come home now with cumstained pants would interrupt her and Roussard's plans to set up the surveillance equipment.
"Okaaaay, he's undressing now," Roussard informs her. Through the phone, Cynthia hears a camera snapping. She selects Mark's cock and increases semen production, wanting him to cum an inconvenient amount on Vanessa's bed. She adjusts the settings, allowing Mark a weak erection.

"He's getting hard, I think. Is that you?" Roussard asks.
"Yep. I'm giving them a little bit of hope," she tells him. Roussard laughs.
"Okay, she's sucking his dick," Roussard says. Cynthia lets Mark's dick get harder as she hears more photos being taken.
"Okay, they're about to fuck," Roussard says.
"Got it," Cynthia deflates Mark's erection with a grin.
"Nice one," Roussard says, "you got him just as he was pushing into her. One pump, and he's fully limp."
"Thanks," says Cynthia, feeling proud of herself and more than a little aroused. There's a long pause.
"Okay, now they're... I don't know, she's kind of spooning him and rubbing his dick?" Roussard says. Cynthia gasps.
"Holy shit, I think he's trying to have her recreate what I did to him the night of the pool party," she laughs, "the thing he tried to tell me he wasn't that into!"
"He seems kind of frustrated, like she's doing it wrong," Roussard comments.
"Good," Cynthia beams.
"Okay, they're stopping that and she's jerking him off," Roussard says after a while, "Man, this guy really is selfish as hell, huh? I mean, surely if you can't get hard, you go down on your partner, or finger her, or something."
"Welcome to the last decade of my sex life," Cynthia says as she allows Mark's cock to get half-hard.
"Okay, I think they're gonna try penetration again," Roussard tells her. More camera snapping.
"He's trying to fuck her, but his semi keeps slipping out," Roussard informs her with a laugh, "she's looking pretty pissed." As this continues, Cynthia takes the opportunity to select Roussard's cock on the app and, curious to see how he'll react to it happening without warning, shrinks his dick.
"Whoa," Roussard says suddenly, "Did you just do something?" There's a sound that Cynthia suspects is him feeling around his crotch.
"Like what?" she asks innocently. Roussard lets out a breath.
"My dick is gone again," he says.
"It's not gone, drama queen, it's just small," she says teasingly, "just focus on the task at hand. What's Mark doing?"
"They're kind of in a cowgirl position with Vanessa riding him, but I don't think he's actually in her," Roussard says, "I think she's just grinding on his dick. He looks like he really likes it, though."

As Roussard continues describing the scene through the window, Cynthia adjusts the settings on Roussard's cock so that he can orgasm, but not ejaculate. She raises his arousal, hearing his breathing grow heavy through the phone.
"They're really enjoying themselves," he says with some struggle, "Mark is, at least. Vanessa might just be showing off to make him feel better."
"Hmm, I'd better make a change then," she says, frowning as she changes the settings, "I definitely don't want her to cum. Okay, what's happening now?"
"He's still lying on his back, but she's sliding off him. Okay, she's blowing him again. Fuck, he looks like he's really... I don't know, like he's right on the edge, like he's so **** it hurts," Roussard pants, snapping more pictures. Cynthia smiles, wondering if Roussard might be projecting a bit.
"And how are you travelling?" she asks. Roussard groans.
"Honestly, I'm just trying to keep from jizzing in my pants right now. I'd get my dick out, but it's so small, I don't think it would poke through my fly, and I don't want to put my camera down long enough to pull my pants down."
"Don't worry, we'll be finished soon," Cynthia assures him, "What are they doing now? Is she still sucking his dick?"
"No, she's lying beside him, resting her head on his shoulder and playing with him, fondling his dick and balls. He still has that same desperation, but I think she's sick of sucking his dick for the moment."
"Do you have a clear view of his dick?"
"Sure."
"Alright, get ready to take some photos. I'm pressing the button," Cynthia tells him, pressing the button to make Mark cum. As soon as she does this, she navigates in the app to Roussard's cock and presses the same button for him.

She listens intently as the sound of the camera's shutter clicking is joined by the sound of Roussard groaning from the struggle of remaining on task as his shrunken cock has a dry orgasm. Eventually, he manages to speak.
"Fuck," he pants, "That was... that was the most cum I've ever seen from one person. Is that what you did to him at the pool party?" Cynthia giggles.
"It sure was. What's happening, does Van look pissed?" she asks.
"Yes. At first she was shocked, but now she's making him get off the bed so she can strip the sheets. I don't think he cares that she's mad though. He mostly just looks relieved," Roussard explains, "They're both covered in cum. I mean, it was like a fountain."

As Roussard talks, Cynthia lowers his arousal back down and returns his cock to its usual size, putting Mark's cockblocks back on while she's at it.
"Okay, they're heading into the bathroom together. Oh!" Cynthia hears the same feeling around she heard earlier, before Roussard exclaims, "My cock is back! Thanks for that. Also, did you make it so that I couldn't ejaculate or something? Because, well, I don't know if you pressed the button or whether I just got overwhelmed, but I came earlier but I don't think..."
"Yeah, that was me," she giggles, "I wanted you to cum, but I didn't want to mess up our plans by making you go home and change."
"I might have to change my underwear anyway. I might not have ejaculated, but I precame a lot," he confesses. Cynthia understands - she's got a wet spot in her underwear too.