How do you 69 not awkwardly

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So my boyfriend brought up that he wants to try 69ing last time we hooked up and asked if we could do it i said no because i didn’t want to at the moment but i’m not opposed to doing it i just haven’t done it before and doing things for the first time sexually is always awkward and im nervous about my asshole being so close to his face do you guys have any tips to make it feel more comfortable??? Please help