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Abstract - I don't think Elsa's sister means to inflict trauma, but I also don't think that means it's not abusive. Violating another person's boundaries is abusive, by my measure. It doesn't matter why it's done, or that the intentions themselves aren't sinister. I also don't think it means she's a terrible, awful person. But I do think her behaviour is abusive, though I'm coming to understand that how we each define abuse is different.
To be quite honest, I don't believe it matters whether or not she has a diagnosis of PTSD. I guess to me it seems superfluous. I care that it's traumatizing and uncomfortable and it seems like Elsa really needs help. I also know how very difficult it is to reach out for help and for Elsa to have done so twice is really brave and I have honestly not understood the responses she's being met with. I know that this touches on uncomfortable things for me, and I think of people I know who've experienced inappropriate familial relationships, reached out (as we're told to!), been met with a lack of support and never reached out again. The consequences were devastating, not only to the individual but it reverberated throughout their later relationships in a negative way. On the one hand, I get that she doesn't have a diagnosis of PTSD, but on the other, it seems like this could be a perfect place for her to ask for help in order to avoid it.
One of my concerns is that even if Elsa moves out of the room, her sister may follow. We can further suggest a lock on the door, but another concern of mine is that it's a tricky thing to enforce boundaries with someone who doesn't want to respect them even as an adult and Elsa is not an adult. She doesn't have much of a support system. How does she change the patterns while keeping herself safe? As an adult, I can leave. Elsa doesn't have the same options as I do. I am also concerned about the part where her sister looks at her while masturbating. I think that can be interpreted multiple ways, but my concern is the possibility that the looking could be intended as an invitation.
I don't know that the police would investigate such an occurrence, but I also don't think police always get it right. A 17 year old masturbating in front of a sister who's asked her to stop multiple times (Elsa mentions "every time" she's tried to talk to her about it) is not the same as a learning disabled individual or a child masturbating in public, and as you noted @
Lucycat, even then efforts are made to correct the behaviour. I would feel the same if Elsa and her sister were two teenage boys, even if they were twins without an age difference beyond a few minutes. My concern is that it's not only Elsa who needs help but her sister too. I sent her RAINN"s contact info yesterday in the hopes that they may be able to advise her on how to handle this because, honestly, I don't know how I would handle it if I were a child. I guess the biggest problem I've had with this whole thing is that Elsa has attempted to erect assertive boundaries with her sister and her sister, for whatever reasons, is choosing to ignore them. It seems I'm in a minority here, but I think that is problematic in a way that can't be accounted for by simple immaturity or lack of understanding and I don't regard this as being at all innocuous. If she can't respect that boundary - which is a super easy one to respect! - then why would she respect the boundary of a new bedroom? How do you enforce your boundaries with a trusted and beloved sister who doesn't want to respect them in a home where a mother has made light of them?
For now, I need to bow out but I just wanted to explain myself further/better/more clearly because I think my responses earlier (while being true to how I think and feel) were very emotional, potentially triggered and likely unclear responses and I don't want to be rude or disrespectful to anyone.