>>79566788Most JP avtubers just do asmr and sell monthly lewd voice packs(1-3hrs) for like $5 USD. Any free stuff is usually on fc2 or their own personal site. Necoma had her fantia stuff leaked here if you want to check archives for the type of stuff they do at the higher end.
None of them really do the stuff that Melody does(or at least not to the extent of the 3D tracking prowess), but if you just want to hear a sweet voice to help you cum, there's lots of options.
There's a lot of dead asmr channels from 2021-2022 that still have lewd stuff up on youtube if you want to check. A few tags to help search:
手コキ handjob
オナサポ close equivalent is JOI but can also include moaning or just sounds that help you cum
カウントダウン countdown
シコシコ onomatopoeia for masturbation
4545 same as above but in number form