So I know two really good ones - CuriousHeights and LittleBlueStar. They are great at much extreme services: hard spanking, hair pulling, heavy slapping, watersports with swallowing, spitting, hard-hitting verbal humiliation, rimming, probably a lot more. Both look great and have a very soft and friendly attitude, and very enthusiastic (I hate this word btw), which is a head-blowing combination for me.
If anyone knows other providers that share similar features - pls let me know, I like to explore these niches.