Asphyxiation in games tends to get paired with facesitting or smothering of some kind from what I've seen, but other than that I haven't seen much involving choking or autoerotic asphyxiation in a while. Breathplay in itself isn't the fetish being catered to in these games/stories, it's just seen as an extension of a scene about asses, or as one of the stock 'dominant man' actions to take during sex, like hair pulling or spanking. It's quite an interesting topic, and I do quite like breathplay personally, so long as the thing controlling my breath/I am being smothered with is something I otherwise find sexy. Like, in terms of both people and specific body parts
I do think breathplay should be talked about more though as a kink and not just part and parcel of certain sex acts. It's almost become so normalized in porn that it's seen as vanilla, but the safety methods the kink community practices haven't had the same reach. Apparently some young guys have got it into their heads that choking a woman without warning or consent during sex is a normal and expected thing to do. Which is terrifying and incredibly dangerous, why the fuck would you ever do that :O
But porn games often reflect porn, and more broadly the society that created them. Art imitates life, which imitates art. If we see breathplay as part and parcel of sitting on someone's face, and not the same as <that weird time where lil Timmy accidentally hangs himself while fapping> then the games we make will have a similar blind spot, I think.
Necro meanwhile is... definitely not my (body)bag. I've never unearthed any fantasies about it, certainly. But I'm a bit of a monsterfucker, so the whole 'is vampire necro' thing is relevant to my interests. I'd say people who want zombies and vampires are more on the monsterfucker spectrum, because zombies and vampires can act on their own (gross as zombies can be), whereas an actual
corpse has no agency. And... afaik corpses not having agency is part of the point for necro people, correct me if I'm wrong? Which is probably a bit hard to simulate in a way a person with the fetish would want, even if it wasn't extremely taboo?