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/