I don't have a problem with it being a sexfest. My issue was with the fact that she was too shy to put her face on the camera in order to get into the building... yet then without complaint hopped on the boss' dick in right front of her friend. Surely there needs to be some kind of explanation for that difference in behaviour, even if it's just a trite "Oh yes, my Mother used to talk about this when she worked in an office. I know this is normal."
That said, I think that if she's too shy to be on camera, she's probably also too shy to have spread her legs for anyone, which means that she'd probably be at least a little bit hesitant to take her first dick like that.
In short: her personality outside does not align with her behavior inside.
It depends on the setting. This was just the prologue, so we didn't really get enough exposition to know what the world is like. But I've read quite a few stories based in a free use world, and even though sex happens all the time, typical personality types still exist. You still have the shy women who get nervous in different situations (like giving presentations, or talking to men they like), but don't think twice about blowing some random guy on the street if he asks for it. You still have weak men who get bullied, but turn around and have sex with gorgeous women.
It's odd, but that's kind of the appeal of free use stories. It juxtaposes what should be normal interactions with outlandish sexual situations. Maybe the prologue could have elaborated a little more before jumping into sex, but that's also a common trope in free use stories. Making everything seem normal, but then blindsiding you with unexpected sex (with the explanation coming later).
I don't know. I'm not the dev. I think I read in the Patreon somewhere that chapter 1 should come out this month, but I can't confirm that.