The first post of a collection of GIFs featuring o faces, otherwise known as orgasm faces or, for a broader range of fun, just sex faces, was such hit that I collected yet more and here they are for your viewing pleasure.
Here are a couple full-size GIFs, then a gallery of GIFs, plus a short vid clip at the end,
I like this next one because the sex face includes some lip biting and eyes rolling back in her head, so that must be hitting the sweet spot,
Here’s the gallery of GIFs,
and last, here is a 2:41 vid clip of a great buildup to and completion of an orgasm, with lots of sex face,