This question takes me back to the first woman to ever let me cum in her mouth. Like any "firsts" it was memorable. She was far more sexually experienced than I was. Several minutes after I came in her mouth, we were talking about this first experience for me. I was wondering if I tasted OK and if she liked it. She grabbed my face and kissed me...depositing the load she had been quietly savoring into MY MOUTH! Surprise!
Well, I cooly swished it around a moment then kissed it back...once she stopped laughing. I got an education that night! ONE: Although I'm told the taste changes with diet, I can now be reasonably assured my cum tastes tolerable to women. TWO: Sometimes women don't swallow when you think they swallow. THREE: Don't ask too many questions...sometimes you won't like the answers.
As for your situation: It's nice when a partner is open minded and willing to indulge fantasies and fetishes. Sometimes though, if they are unwilling and you push too hard until they finally give in, neither one of you will enjoy the experience. Genuine enthusiasm is the best turn on.