Not much I can add for praise that hasn't been said already. Good poses and animations with lots of subtle movements and long loops that keep it interesting, good choice of music, etc. Two of the three poses work well in VR too, just by possessing the guy.
What I will say is that there are two things preventing it from reaching five stars.
First is that the environment is nearly blank, of course it's not meant to be a big complex scene so that's fine but it still makes it less immersive.
The other is that there's no throat bulging. With the size of the guy's dick and how deep Kera takes it there should definitely be a throat bulge but there isn't. The Auto Throat Bulger plugin can be added to implement this and it works fairly well with the default settings, but would've preferred if it was there scene by default and was more specifically tailored to it.