I don't get the point of using the netorare tag when it's more like an open relationship. Like can it even be netorare if the MC has a big dick, has a good relationship with the girl, and is still fucking? Even netorase is stretching it, if they are both fucking other people. And the MC having a big dick sort of defeats the point of the entire "bbc" angle, considering his dick is just as big as the "BIGbc"
Because as talked about elsewhere there's still a lot of NTS elements not really found in a normal open relationship? Yes the MC is a dominant with a big dick that will also get plenty of girls. But at the same time Vi teases the shit out of him (which he loves), he engages in voyeurism and she does things (like the photoshoot) specifically to send him images (and I'd guess later video) and tease the shit out of him. These aren't things a normal open relationship would usually have, and are more indicative of the increased teasing in a NTS relationship, whereas in a merely open one they wouldn't go this far to tease their partner about it.
The same sort of thing is the case in Moonripple Lake, dominant hung MC that has a healthy relationship with LI and also gets to get with other girls and not just be a submissive cuck watching at the side all the time.
I personally love this newest evolution of the genre, and I think it's letting a lot of people enjoy it that otherwise would not while still hitting a lot of the key notes of the teasing sluttiness of the traditional genre.
Although to be fair it's not NTR with Vi, it's specifically NTS with her as said in the OP post. There's NTR elements (Eric's voyeurism and the teasing of the girls generally) but the tag is there more due to F95's own policies than anything else.
And the BBC angle seems to be aimed more at white guys NOT named Eric. We've already seen Sai and he doesn't measure up to the black guys in game (or Eric) and Ari is very clearly I think the girl that's a bit of a "snowbunny" for those that are seeking that particular archetype. Or at the very least a girl obsessed with big dick that has a more normal sized boyfriend. I assume CG will play with that a bit more in the future and some of those that like that type of thing might get at least some of what they want out of the Ari/Sai dynamic.