how do i orgasm from him eating me out????

my bf eats me out all the time and sometimes it feels good but i feel like it should feel more amazing like people say it does and i really really want him to make me orgasm....how should i tell him to do it??? he wants to pleasure me so ive tried to show him but idk really how. i told him how to rub my clit and stuff but idk does anyone have tips????