((((crystalrose))))) a lot of times people who have been sexually assaulted or otherwise abused as children have difficulties knowing where appropriate boundaries should be. This is because they were never allowed to maintain their own oundaries as children. So it gets to be like all or nothing. I agree with Ophelia. Your sister will not be hurt by you drawing appropriate boundaries, though she might be mad at you Hope that you can find some way to be supportive but not let yourelf get drowned