Advice

My boyfriend and I have been together for 2 years now, everything is great. Our sex life is good but just one problem... I give him head all the time (I don't mind at all😉) but he rarely goes down on me maybe every once in a greaaaaaat while and when he does it's always a little clit flick with his tongue then its over he thinks it's pound time. How do I convince him to eat me...longer? I guess that's how to say it..idk. I get super nervous about talking about it to him cause he gets all quiet and just looks everywhere else like I'm getting on to him. idk. Ladies do you have any tips or advice????