It was the Mammary stone.
It worked much like the normal stone, except that any wishes made using it stood a 3 in 4 chance of inflicting random mammary growth on both the person making the wish and any targets of the wish. The mammary growth wasn't restricted to human breasts, or normal number or positions. In addition, there was a 1 in 3 chance of lactation being induced as well. The changes would not necessarily be instant, they could take up to 24 hours to finish.
The shadowy figure smiled to itself in the dark, and silently left the room.
