I think you cast it first without directing it anywhere, then when it's cast, you use it on someone, like a special item, which they can then pass or fail a save on. I might be wrong, though, I only used this once ages ago.
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Goddess of Undress
Co-owner of the Evil Petting Zoo and Sorceress of the HADB
OLD COOTS eye candy and Disrobed Division of the ORT
And her sidekick Pink
"High hopes...an endless river...forever and ever"