Eating ass? 🤫

So my man has told me that was his fantasy getting his ass ATE 🤨 And I’m open to it but I’m a very easily disgusted person and even if he’s out of the shower I feel like ima gag and I don’t want that, I want to do it but don’t know how to start. Do I just lick slowly, fast? How? Someone explain or I’m open to any tips😊