Yeah, the closest a male body has to inside a vagina is your gums and the area inside your asshole (at least out of the relatively easy places to reach).

Also, women tend to have skin that isn’t as tough, so something feeling fine on your own skin doesn’t mean she’ll be ok with it. And friction causes wear (including from your tongue), so try to not focus overly on the same areas, take breaks, and use lube. If you aren’t using condoms or toys, oil-based lube is better than water-based lube in that it lasts longer.