Spell (2014) aka "Nam Man Prai".
A monk/sorcerer is caught in customs with a strange vial, a love potion he claims. It gets into the wrong hands and soon poor Prae (played by Wanida Termthanaporn) is infected. She goes from sweet, shy office girl to a sex fiend. Somewhat literally since during sex she transforms into this monster (a "ghost" in the translation) that looks like a cross
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