Leaving this in degeneracy since this is pretty disgusting, but there are now rumours going around that Natsumi Moe (AKA Shoiri Novella's VA) did loli voice acting on /b/. There's screencaps for it and everything, as well as a few vocaroos that have managed to be salvaged.
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Personal opinion? If it is her, it's likely all dumb fantasy. The vocaroos are garbage tier and pretty bad quality so I can't even tell if it IS her. But it sounds like the girl in the thread is trying really hard and failing miserably.
EDIT: This is complete bullshit, and I'll show why:
From the thread where the girl is talking about having rape fantasies and everything, she mentions needing "better quality equipment":
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Now here's Natsumi Moe in October of 2018, prior to this thread:
She already has WAAAAY better quality equipment than the girl in the thread, if those archived recordings are the same. And if that's the case, then there's no way they're made by her. This is just a shitty old rrat dug up from /jp/'s bowels in an attempt to stir up drama in whatever way possible.
I think this is someone else. I forget the name but there's some woman who's been making this sort of stuff for a long time, a good handful of years (around 9 or 10) at least. She posted stuff on some adult subreddit too for a while, if it really is the same person. They sound pretty similar.