No, I haven't and I have no intention of doing it. I want to, but I just can not.
Now, this, is a true incident. Bless this ATF of mine, I loved that girl to pieces. Once, on my upteenth visit, she .... let me finish it orally and then..... she crawled up and sealed my mouth with hers. Within .009 seconds, I was sitting up, gagging. She quickly handed me a towel and I was able to spit it out.
We always laugh about it.
Having said that, I like tasting my precum. Having said THAT, I have not done it in ages, but I kinda like playing with it during masturbation.