Fluttershy's been outside all day, working hard with her animals and getting dirty.

Spike's been inside all day, working hard with spatulas and bowls, getting dirty.

So when they finally see each other again at dinnertime, they decide to get dirty and eat.

No food play, just various face-bucking. I mean, they definitely use their mouths...

EDIT: Now has a READING! Go check it out, ScarlettBlade set it up here!