>>936763214This is also great advice. I also started with a finger in her mouth, she now often takes it between her lips herself and acts like she is sucking on a cock. Give her some feedback as she does it, as anon suggested like telling her she would look great with a real cock in her mouth.
Introducing double penetration fantasies also helped. Took a while but my fiance got into anal like that since she wants to try it for real so she needed to practise a lot with plugs, my cock and a large dildo.
Most important thing is just to make sure she feels great with the fantasy. If she is already teasing you with it, just enjoy the show and DO NOT RUSH things.