Best blow job I've ever had.

So last night my husband told me after we had finished up that I had just given him the best head he had ever received. He's never once in 9 years said anything in regards to my oral. Trying to take it as a compliment. Anyway he added if I would let him finish in my mouth it would be over the top. I've tried so many times and I just gag until I vomit. The reflex is really bad when I give him oral as well but I control it and put it at ease the best I can. I've gotten better at it. But if I knew it was coming i wouldn't be able to do it. I would anticipate it being in my mouth the entire time. How do I spit/swallow under such circumstances. Love for an easier clean up and better moment.