So Addictive, Isn't It?
Oh, I adore that, makes my mouth water. But beware, let me tip you off from experience.
The key is cleanliness. Go the extra mile to assure the anal passage is clean. Begin with diet. End with a deep cleansing. Sounds like that's time consuming, but it's worth it. Especially for ass kissers like me who will attach their lips to an asshole for extended periods of time.
The list of diseases attributed to ass kissing is long. A lot longer than you would think and so very easily attracted, it's frightening. Twice I attracted a parasite. And whenever I kiss dirty ass (yep, I do it too) I am almost always assured a burning blast of herpes simplex the size of half my face for a few days.
I think if I did it because I was solely interested in pleasing my mistress or the face fucker working me over, that I would retire from it. But, damn, I adore sucking ass, love it, can't wait for more!