I suppose that the million dollar question is what's on her feet. It looks like cum, and what she's doing with her feet looks an awful lot like a footjob, but it's a ball of some sort under her feet, not a penis. But if it's not cum, I have no idea what it is, particularly when it seems to be stringy like cum would be, and most liquids aren't like that.

Maybe the ball is the guy's hat
8)

That's a planet with full of water, you can see the clouds and seas, it's probably something like an earlier Earth because there's no lands on it. And I think the liquid on her foot is just water, because her foot affected atmosphere, water vapour condensed on the surface.

plot twist: the ball is a penis.