And the word that breaks your logic is 'consider'. At that point, it is your personal feelings that override everything. As I said, by definition, this game does not have NTR.
We can run up multiple definitions, if you wanna put it to the test:
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"Netorare is a genre of anime, manga, or video game focused on infidelity. Commonly a subgenre of pornographic hentai anime,
netorare storylines typically focus on the internal distress caused by one member in a relationship cheating on the other."
There is no committment to a relationship with any of the characters we've seen onboard. The Captain often refers to DEMI as his best mate. There isn't marriage, there's no rings on fingers, no one's religious besides the Imperium (aka the bad guys).
The Captain also says this:
Meaning he has no intention to stop using DEMI because he's just fucked Lily. To which Lily replies:
At that point, you have two adults making a decision that they do not care if the other fucks anyone else.
We can throw up another one, just for a more fleshed out definition:
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" A term used for a story theme that focuses on a particular type of cheating/
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in a relationship in an adult-oriented real-life video, manga, or anime. The person that cheats is initially forced against their will (either physically, by being blackmailed, or by the influence of an ingested or injected mind-altering substance) by
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(s)/perpetrator(s) to participate in a sexual encounter but then is mind-bended to enjoy and/or accept the experience. Also, the cheater often is not fond of the instigator(s) before the encounter and may state that they love their significant other at any time in the story, but ends up deciding to continue the affair with the instigator(s) afterwards. The victim (the person being cheating on) is usually unaware of the betrayal by the cheater, and the instigator(s) if the victim knows him, her, or them. The story often hints that the victim may never know/find out about the continued affair. This theme is intended for
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and will end up
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some readers, but others will find it arousing."
The waifus aren't forced, they are independent characters.
They've never gave any indication they aren't fond of the mantics, nor is there any comparisons to the Captain
The Captain is fully aware of these activities, and is not made to feel inferior
This is literally facts over feelings. If you feel like this is NTR, then I'm sorry that you feel like the world is constantly against you that has you in such a mindset that a fictional character having an independent way of thinking somehow personally hurts you.