To book one, ㄥ乇乇 卂ㄥㄥㄩ尺乇 is probably the best. Super skilled and can drop you really quickly, won’t waste any time. She literally teaches this stuff at conventions. I think Queen of Dreams also does bookings, but I’ve never tried her before.
Niteflirt also has some dommes, though most are role players. The two I know are the real deal are TheDivineMistressJasmine (amazing, Ea丂ㄒ乇尺几 European accent, reasonable rate, good mp3 files) and PrincessMindFokker (Goddess Sue). Goddess Sue is top tier talent, but she is expensive, takes her time, and isn’t online much. Also, b311@ddiction Hypnosis (b311@) has had some files shared here that were well regarded, but she is never online. Can’t vouch for her live skills.
Best of the best is Mistress Joanne, but I don’t think she takes new subs anymore. Got lucky there!