How would one go for commissioning an hentai manga from an circle or artist? I already have the fandom, story/plot & characters planned out, and now I wanna go onto making it into a reality. But the process I'm wondering on, like where would I find specific artists/niches? Pixiv? Elsewhere? And what about costs?

Looking specifically for artists who specialize in ryona/reverse ryona as well as guro, (also not sure if there is much for the Pokemon-side, especially for those topics) gritty artstyle would be nice too