Anon challenges the mane 6 to a simple game of soccer.
Twilight The Mare. The Myth. The Legend! gets hit in the face with balls as per the title... not much else here aside from some light RGRE and crude humor in the form of a shitpost-like story.
Warnings are mostly for references except for violence... because Twilight is getting hit in the face with balls as the title implies... if you really don't get that bit by now I don't know what to tell you.
Cover is edit I made from this which was made by some cool artist bros. (ericneomatrix and seniorpony