Lucky you...my wife from day one wanted me to lick her pussy after he cums in her. Right now, my wife is just fucking a friend of mine on a steady basis. She is happy with him.
Yes...whenever my wife gives me a blowjob, she insists on holding my cum in her mouth and giving me a cum kiss. I don't mind and have gotten to enjoy it.
You can't let up....keep bringing it up every chance you can. I introduced my wife the same way. Even had to ask her who she fantasized about that we both knew. Turned out the first time she did it with a good friend of mine. It was such a turn on for me. Good luck.