Having given and received MANY rim jobs, I can say hygiene is KEY. The receiver better is straight up honest about being ready for such a treat. And the giver needs to avoid making the space too wet and gross. Mixing it up with fingers and fast to slow motions with your tongue keep it fun. Listen, I’ve gotten people off just by taking my time with my tongue. Can be magical if you’re willing to do the work.
Have them shower first. And make sure they clean it very well. My hubby liked to be on his hands and knees. While you are licking the butthole don’t forget the taint and rub the balls as well. Always drove him wild