I'd like to say that week got him used to eating cum but it didn't completely, he definitely was less reluctant and over time after that he finally was able to lick me clean without being "forced" (I will say he seems to enjoy it a bit more if I tell him to eat it in a firm tone though).
We've incorporated his cum eating into usual routine and he's become an even more attentive lover. I always tell him or ask him to lick me clean, though more as a way to reinforce I'm ok with it and to give him encouragement if he's having trouble getting motivated to do it himself.
Sometimes he gently licks me clean after sex, sometimes I ride his face, there's times now I give him head randomly just because I want to see him lick his cum off my tits or just kiss him. He knows now that he's gonna be tasting cum anytime we have fun, I truly believe that's what eased his shame fully. And the best part is after he has tasted himself he becomes so eager to pleasure me any way I desire so it's a win win.