TL;DR:
You can now change the characters names for the story
A big thank you to forum user
thisisnotpornography who made a great point about the stories usage of character names. I chose to let the characters address each other by their name to add to the realism in the dialogue but I agree it can take you out of the story more than necessary. Unless of course your name is actually Matthew (in which case, hi Matthew, hope you enjoyed the story haha).
Because changing the name of the main character in VaM is, to my knowledge, impossible (that is, making his name a variable inside VaM which is called for the dialogue and story texts) I thought the alternative would to be not have the characters address each other at all, which would result in a lot of work rewriting the story and editing the scene. Then I remembered VaM uses json files for its saves. And with the help of windows' text replace feature I wrote a little batch file which replaces all of the occurring name drops for the MC and changes them to whatever you like. And because doing the same for the milf's character wasn't much work you can change her name now too!
This approach uses variable names which get overwritten after you have changed the names, so it comes with the downside of only working the first time you change their names. And it would be even better if there was a way to change something like this inside of VaM and not outside of it. So if anyone has a different and better approach I would gladly hear it!
Zwega out <3