The Same to You Doubled by Robert Sheckley. Short summary

5 seconds

Edelstein gets to make three wishes. But his enemy will get twice as many. Then the man wishes for a woman whose sexual appetites will be twice as much as his enemy’s.

1 minute

Edelstein is visited by a representative of the Devil. He promises to fulfill any three desires of the man, but on the condition that his worst enemy will receive double.

And that enemy turns out to be Manovich, whom Edelstein considered his best friend.

Edelstein wished for twenty thousand dollars and learned that Manovich received forty.

Then he wished for six hundred pounds of chopped chicken liver. Edelstein made seven hundred dollars on it.

Manovich, however, earned $2,000. Edelstein scolds himself and decides to make one last wish so as to accurately mess with Manovich.

He orders an acquaintance with a beautiful woman whose sexual temperament is at its limit.

Edelstein gloats, because Manovich gets a woman whose sexual appetites are twice his capacity.