No

"I wouldn't say that," Mark says gruffly, sitting up, "I mean, it's hot to think about two women fingering each other, but you acting like I'm Vanessa while you jerked me off was just plain weird." Of course he'd deny how much he enjoyed it, Cynthia thinks to herself, and of course he's already trying to rewrite what happened. I don't know what I'd call what I just did, but I certainly didn't jerk him off.
"You certainly seemed to be enjoying it when you were begging me to touch your-"
"I was just playing along because I knew you liked it, okay?" he snaps, getting up off the bed. It's hard to take a guy seriously when he's covered in such a huge amount of his own cum.
"Jeez, sorry. I was just teasing, it's not like I thought you'd discovered a new fetish or something," she assures him. His expression remains annoyed.
"Can you take care of this?" he asks, gesturing to the bed, "I need a shower, and I don't wanna deal with this for a second time today."
"Sure!" Cynthia replies, chipper and yielding.

A few days later, Cynthia's on her way to work when she gets a call from Vanessa. When she picks up, Vanessa starts talking before Cynthia has a chance to ask why she's calling.
"You told Mark that you and I had SEX at the pool party? What the hell?" her irate voice demands.
"He's my husband, Van," Cynthia replies, "I love him and we've made a commitment to each other. I can't just have sex with somebody else and hide it from him."
"Oh my god, Cynthia, that was not sex," Vanessa says in an exasperated tone, "it was basically masturbation. I needed to get off, and you did me a favor."
"That's what Mark said," Cynthia says. Everyone keeps saying that it wasn't real sex, she thinks, I wonder what Mark would've said if I told him I'd gotten a male friend off with my hands?
"Well, he's right," Vanessa says, "Ugh, I'm so embarrassed that you told him that."
"Why?"
"Why? Because it's personal! I don't want Mark knowing about my sex life!" Vanessa tells her, as though it's so damn obvious. Your sex life? It seems like pretty often your sex life and my husband's sex life are one and the same, Cynthia thinks, annoyed.
"Well, I didn't want to keep secrets. It's bad enough that it happened. If you didn't want me to tell my husband that we had sex, maybe you shouldn't have come onto me," Cynthia snaps.
"Stop saying that! We didn't have sex, and I didn't come onto you," Vanessa says indignantly, "I asked my friend for a favor that I really needed, to deal with a problem that's super private, and now Mark knows all about how the guy I'm sleeping with can't get hard." Is that what this is about? Cynthia wonders, Is she just annoyed that Mark knows just how much his sexual failures frustrate her?
"Okay, I'm sorry," Cynthia sighs, "I didn't think it would be an issue. And if it's any comfort, I didn't go into the specifics - I just said the guy she was with couldn't make her cum."
"Okay, well, maybe fucking ask next time before you start telling everyone who'll listen that we had sex," Vanessa replies, still pissed off.
"I really am sorry, Van. It won't happen again," Cynthia assures her friend, cringing at her own grovelling, "Are you okay?"
"Yeah," says Vanessa, "It was just kind of a shock. I feel violated, you know? I thought I could trust you to keep it between us."
"It won't happen again," Cynthia repeats, "You can trust me." Vanessa sighs.
"I trust you," Vanessa says.
"Anyway, how are you?" Cynthia asks, changing the subject, "Seen that guy again?"
"I just saw him this morning," Vanessa groans, "He stopped over at my place on his way to work. I tried getting him hard, but I don't know why I even bother. He did finger me a bit while he stroked his soft dick, but it was pretty clear that his heart wasn't in it, and he gave up before it got even remotely good."
"That's rough. But hey, at least he's doing something for you," Cynthia says. Vanessa snorts.
"Yeah. Honestly, he might as well not have even tried. He wasn't half as good at it as you were," Vanessa says. Cynthia blushes, feeling a conflicted sense of pride.
"Uh, thanks," Cynthia says.
"Well, I guess I'd better go. Unless you want to stop by for a quickie," Vanessa adds jokingly.
"Har har. Alright, I'll speak to you later," Cynthia says, "Love you."

Cynthia frowns as she continues on her way to work. Was she really blowing what had happened between her and Vanessa out of proportion by calling it sex? It had felt like sex. She thinks about her conversation with Vanessa, and all the signs that Vanessa and Mark had clearly just been together. It can't have been more than a few minutes between Mark leaving Vanessa's place and Vanessa calling Cynthia. She wonders whether Vanessa was still naked when she called her, whether she hadn't yet gotten up from wherever it was that Mark had tried impotently to please her. She wants to know every detail so badly, to see and hear as Mark embarrasses himself and leaves Vanessa unsatisfied yet again.

She continues thinking about this for the rest of her journey, and by the time she arrives at her office, an idea is beginning to form in her mind. Before heading inside, she takes out her phone and searches "private investigator near me", then, "affordable private investigator near me". She settles on the cheapest result: Incognito Investigative Services, LLC. Their site is poorly constructed and full of material all about how your partner is almost certainly cheating on you. They offer free consultations. Cynthia punches their number into her phone, but hesitates, her finger hovering over the button to call.