After acquiring Siddhi whenever you wish to use it to attract someone you have to Abhimintrit [bind] a flower with this mantra. TheN give that flower to the person you wish to attract to smell. This will bring that person under your spell of attraction.
Om chamunde jai jai vashyakari sarva satvannmah swaha ll
ॐ चामुण्डे जय जय वश्यकरि सर्व सत्वान्नम: स्वाहा ll