The difference comes up when/if you start Helena's romance quest to enable custom slaves. You can keep Scarlet as a slave with no deterrence up until then, but at some point in that quest line, Helena will require you to give Scarlet back. If you don't, you obviously keep Scarlet, but you lock the option to ever order custom slaves through Helena for the entirety of that playthrough, and you will not get the option to do so ever again unless you reroll the save or start a new playthrough.I mean once you buy Scarlet you can free her or keep her, I guess I really wanted to know if there is any difference between the two but from what it sounds like you get Scarlet on keep and the option to bang Helena if you free Scarlet.