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This train of thought has a serious set of plot holes to overcome where this is an option.
David finding out about Marvin, yes sure very doable within the story, but it comes down to:
1. David doesn't even know Marvin exists. As hints, clues, and irregularities point that something is up with Anna, David would not be able to make connections with Anna's activities with Marvin. For now, David is aware of other men around her, like Hank, Jake, Robinson (more so now that David knows Anna was at Robinson's house).
2. I hate bringing up over and over the whole spy camera thing, but Marvin would know of them and how to access the data. More to the point the only real place those cameras could get anything good is Anna's private breast pumping room-- anyone other than Marvin, Anna herself would have to invite them into that room.
3. Without some kind of evidence, like pictures and video, how would Kendra be able to prove any Marvin/Anna interactions?
4. YES! Marvin is a dried-up old man well past his prime, and Anna is a goddess still in her prime. So if someone was told anything about Anna and Marvin, who would believe that someone like Marvin got to rail Anna--a woman who could have just about any other man? And this would include David. It'll be like reporting a Big Foot sighting.
5. Most adults deal with rumors as just what they are. So a rumor starts about Anna and Marvin--just how many would take the rumor serious? A rumor about Hank and Anna...; or Jake and Anna are much more plausible for people to give it any serious thought.
To make the Anna/Marvin path devastating, especial toward David, Anna and Marvin would have to be caught in the act.
(TLDR: agree, lol)
All of that is pretty accurate. The difference between someone like Chris and someone like Marvin is that there was a long prior relationship via her husband. That and Chris never really kept it all that much of a secret that he was attracted to her. He claims he hid his feelings but I'm sure it would be somewhat obvious to at least her, if not her and David. A rumor about those two wouldn't need much supporting evidence to be taken somewhat seriously.
Marvin? A stranger to everyone until recently and he's old as fuck. It would take absolute proof for that to even be believed or taken seriously.
I've mentioned before but I basically found this site after fucking up the only relationship I ever gave a fuck about for a dumb fling with a coworker. My ex heard things long before she ever knew I cheated...and it was very easy for me to brush it all off. Getting caught took the chick I was stupidly fooling around with telling her directly. Short of that or videos/photo proof and my ex would have taken my side with any rumors. Zero doubt.
So the Marvin angle in this story, if it revolves around blackmail or David finding out it would require proof. Rumor wouldn't realistically move the needle there.
For a porn game I have praised the pacing and realism so far with Chris specifically. Again, it's a dumb porn story so a lot of unrealistic shit happens but the thing you can make realistic is the pacing and reactions of characters to news.
David doing anything but rolling his eyes at a rumor of a 900 year old man fucking his wife would be incredibly unbelievable.
So...he needs to film it to some degree. Be it fucking or touching her in general, proof has to be had or it basically never happened in the minds of anyone but those two.
On a final note with a different topic, I'll repeat that the dev doesn't need to rush the Chris storyline to the point of fucking IRL but it has to happen in the story timeframe to maintain realism.
I really hope the dev doesn't pull an AWAM and have her bring EVERY man in the story to the point of a BJ before moving on. That's not how humans - even whores - behave.
Though, oddly enough, the men that seem most likely to progress with Anna based on the story alone are Marvin and her father's longtime friend. Maybe the neighbor if the dev were to write a scenario where he somehow saw her blowing Chris, got proofs and blackmails her. Maybe?
So it seems like an old man would be next just based on what we've seen so far and their relations to each other.
Old friend has a long-time longtime relationship with Anna and now power over her via work. Marvin has his own works but also the backing of the main antagonist on top of that. Antagonists, really. So it's sort of a 3 vs 1 with Marvin and Anna.
We'll see but I just want whatever continued realism we can possibly have in what is always a dumbass porn story. Give me a little realism in a setting that by nature is unrealistic and illogical. This one has done that so far.