Κώλος, δάχτυλο και γλώσσα γαμήθηκαν

It may be a good idea to use your tongue to lick and explore her anal area, thereby increasing

her pleasure and stimulating her appetite.

This technique is called anal lingus.

you may begin to stretch the sphincter carefully.

Yes, you'll need to apply lubrication to your finger to prevent any unpleasant friction.