I've thought about such a thing before. Perhaps not simply a reading out loud, but more along the lines of audio dramas. Narrator's voice, character's voices, foley sounds and fitting background music. Well-produced and not just recorded in someone's basement.

Or maybe just read by someone with a sexy voice. Think Kate Beckinsale. :)

Alternatively, perhaps just custom sexy/guro-related one-shots acted out by a voice actress. Like video game injry/death sounds, but more... custom.

I've skimmed through a video or two on the channel you mentioned, and it's definitely better in quality than I was preparing for. Props for that. Tbh, the genre of the stories is not my thing at all and I prefer a different timbre of voice, so I'm not interested in this content, but well done regardless. It just needs a little more clarity I think; dialing up dynamic range compression more or boosting the midranges a bit should solve it.

Wrt payment, I know it's Gurochan and it's probably not the best place on the internet to have discussions about copyright, but the thing about derivative works (and an audio retelling of someone else's story is a derivative work) is that they're either distributed for free, or the author of the original receives a cut. Regardless of whether there's a contract between you and the author of the original, it's widely agreed to be a fair practice from the ethical POV, across all kinds of derivative works, from fanfiction to bootleg remixes in music. Your audio wouldn't exist without the original author writing the story, so it's only fair that not all money received goes to you. With that in mind, you can either
– send the author X% of the money received
– make an agreement with them that the money sharing starts once you hit N$ and not earlier (it's all about the author's consent that at first all money made on something that they are a part of goes to someone else)

I don't know how reasonable it is to expect that you make a lot of money from this, but consider this last paragraph anyway, this is a widespread POV when it comes to derivative works.