Some girls train their ball kicking.

http://g.e-hentai.org/g/769814/fea84b2481/

And from the same artist, a mixed boxing game.

http://g.e-hentai.org/g/867745/45079e0be8/

And here, a row of girls line up to bust some kid's balls.

http://g.e-hentai.org/g/868051/f62b8384a9/