There are no known cases where this spell has been used without the recipient dying when the duration ran out. As such there is nothing to put for the usual tale.
Ultimate Witchery of Seduce Angel (Mage)
Duration: 1 month per caster level
Area of Effect: 1 other
Range: 1 mile
This spell causes an Angel to come to earth in front of the recipient, and be in love with them for the duration.