From Creatures Wikia
Cupid's Lyre is a magical, stringed instrument designed to put any creature that hears it into a romantic mood.
The Hand can play the lyre, and you see little pink or blue hearts emanating from Norns that are 'in the mood'. When the female gets pregnant her pink hearts disappear, so you can quit playing the lyre.
Many male Norns learn to play the lyre when they want to interest females. Also, in the case of violent females like Fiona, the famous 'serial killer' norn, the lyre will induce her to mate with males rather than slap them to death.
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