Masochistic Weapon

Upon command, a masochistic weapon is sheathed in a writhing, dark glow.
Book of Erotic Fantasy
Author: Gwendolyn F.M. Kestrel
The effect remains until another command is given A masochistic weapon deals an extra 2d4 points of damage on a successful hit and the wielder takes nonlethal damage equal to half the damage inflicted. Bows, crossbows, and slings so crafted bestow the effect upon their ammunition.
Moderate evocation; Caster Level: 8th; Craft Magic Arms and Armor, inflict light wounds, shield other, Price: +1 bonus.