This must be what compulsion feels like, were one able to consciously recognize that they were being compelled. Quinn knows she's been compelled before, Rebekah having admitted that much to her some time after she made the decision to follow her Original best friend back to her world instead of heading home to her own once they found a way out of MarinaNova. She's since been wearing a vervain locket and drinking vervain tea every morning to prevent repeat occurrences, so having been compelled by vampiric means to launch herself towards the unsuspecting vampire is ruled out.

Something else is doing this.

Whatever it is, Quinn now has the fingers of both hands curled around the collar of Rebekah's jacket, and her lips firmly pressed against the vampire's.