He then later, in his traditional forward and dominant manner, initiates sex with her.
Bond, who managed to figure out this about her, agrees to help take down her boss thus helping her. Sévérine is a character who was forced in to prostitution and has been abused. Lets ignore some of the already questionable typical Bond stuff here – his arriving in her room unannounced, entering the shower without being in any way invited etc etc – and just think about the characters for a second. Here's someone's writeup about it that conveys the absurdity better than I can: Compare that to the awful shower scene in Skyfall.
