Judging by how dulled-out white-hair's expression is coupled with the defeated way she's gripping the redhead's hair, and how smug the redhead herself looks, I'm also reading more the delinquent angle than BDSM. Kinda along the lines of "You and me fight, winner gets to pick anyone here to fuck." One violent beatdown later, the redhead decides to stall for time, lighting up her cigarette before she tells her opponent that she was after her the whole time.
I dunno. I try to see more of the plot that led up to a moment like this.