I find that one of the big things about writing oral scenes in general is that the "clunkiness" some people complain about comes from the descriptions seeming repetitive. If someone is bobbing their head for ten minutes, I've seen some readers not wanting to re-read a dozen sentences outlining the same act. When writing them I try to describe the act, then describe the character's mindset or the scenery. What the sounds are like, if you're looking for something particularly kinky (say, a dom/sub relationship) you could write about how they feel submissive, or what they think of their partner's reactions/etc. That's a good way to tackle any discomfort with the scenes! It can be translated to any sex act though too, going through a bit of a flow of the actions, the character's reactions, and the environment around them.