Actually, she apparently DOES actually get off with Kirito's dick, the fact she has basically gotten herself addicted confirms it, in fact she DOES actually like it more than Hebishima's from what the context of her scenes has implied, the only issue she has is Kirito not lasting long enough for her to actually do it whenever she wants XP (She has gotten a workaround for that in-game with that stamina potion it seems, though)
Also, as a reminder, the only reason she went to the brothel to work was first because Hebishima introduced her, but then she took the job by herself because she wanted the money for her own things (Hilariously, the main reasons were all Kirito-related, and practically never did actual sex...hell, she only fucked that dude from the council, and ONLY by putting Kirito's image on top of him for herself, was because she wanted a skill that would let him molest her Onii-chan in-game as much or more than she did IRL. Also, even better, now that she got her alliance with Sinon going, she NO LONGER really needs to work as Flora the prostitute, Sinon can literally give her anything she needs that she could have gotten with the job in exchange for working for her after all

).