It's not a path i would favor in my "main" playthrough, but it's certainly something daring to explore in alternative runs.
Wether because of attachment to the character or fear of the "WE ARE GETTING CUCKED(despite this being easily avoidable)" crowd, she went for vanilla.
I feel like this isn't the only example where personal attachment to the characters may have hurt the story, things like Layla taking being ditched for her sister without any issues felt weird and detached, Nyx can write better than this, i know, i've seen it... maybe comes from not wanting to see her characters looking like a crazy emotional mess that some players will make fun of.
For all the teasing that things will go balistic if these girls find out about each other, there's awful little fireworks.
I will also say that despite this game giving you the option to be a manwhore that flirts with every girl in town, it doesn't do it well.
When you are with a girl the game defaults to you caring deeply about this girl and not to "i want to get laid, and i will lie and deceive for it".
The sloooooow burns(and how patient our guy always is with it) aren't suited to a guy that just wants to sleep around.
The fact that Nyx herself says, "i'm not happy with this scene, it's gonna be released in this state anyways and i will change it at later date" makes it sound like poor planning, maybe re-address this now, do the necessary nips and tucks before releasing?
Not to mention she already hinted that there's one specific occurance on the MC-Erynn-Alexis triangle that she means to change from past chapters, and she said that after she had just released a reboot version...