Tasting your own cum? Easiest for me has always been to kiss her after she's taken my load in her mouth. If you do after she swallows you dont have the texture to get over and all you really get is the aftertaste, which will help you getting used to it. Or you could have her force feed it to you, my wife used to do that, but she's really greedy with her cum so I don't really eat it that often, just a taste now and then.
we've kissed after I've cum in her mouth but you're right - because she swallowed, it must have not been the same ...