The grip tightening on their hair gives them a little jolt of pleasure but what pleases them more is the goddess asking them go harder.

“Harder… got it. Guide me well, I’m a novice at this, darling.”

And with that, they press their mouth to her slit, tongue now pressing harder and firmer against her bud. Not too hard, but probably with enough pressure to feel like giving it a good rub. The merfolk’s tongue moves up and down, maybe perhaps treating that bud nearly the same way they’d tease a cock. In any case, they’re clearly going at her enthusiastically, taking in the sweet scent and taste of her.