“If last year's enchanting "Water Me" found FKA twigs at her most doe-eyed and mystical, and elegant stomper "Papi Pacify" was the UK singer in a mood of vulnerable desperation, then her latest single, a beguilingly straight-laced cut of silken R&B, is a commanding blast of raw sexual power. Like the anonymous goddess she portrays in her Nabil-directed video for "Two Weeks", FKA twigs is larger tha”