The Kama Sutra is a joke, IMO. The sex positions they describe are relatively tame by today’s standards.
The Joy of Sex is marginally better, but they fail to describe many of the more extreme positions, (like the various face-sitting and mouth-f——-g positions I mentioned in a different answer).
I dare say, you might look to lesbian sex books and videos for ideas on cunnilingus. I don’t have any particular books in mind, But when I was a randy teen, I could spend HOURS in the “Sexual Health” aisle of Borders whilst my mum was in Sears or Macys :-p
The best thing to do, IMO, is to use your imagination to invent positions that turn you on. Seriously!