Questions: Family & Friends

OK, I'm 26 and my little sister is 23 years old and she lives in the appartment with me. When she was 6 and I was 9, our mom died and our dad (who was a mysogynistic asshole) started drinking heavily and he physically beat her on a regular basis up until she was about 12 years old. I rember after he beat her she would always come to me for consolance and I would hold her and soothe her to sleep. Don't get me wrong, my sister is an incredibly sweet and caring person, but 6 years of continous abuse took a heavy toll, left her with severe PTSD and stunted her emotional growth (right now she has about the level of emotional development as a 9 year old). When she was 18, she moved in with me at my appartment and she's like my best friend in the world and because of her PTSD, she's an extremely affectionate person. Whenever we see each other after work she gets a long hug, she snuggles up next to me and we share a bed and cuddle together each night. We talk for a bit and I usually play with her hair or rub her back to put her to sleep. Because of her PTSD she has trouble falling asleep alone and even if she does she has nightmates. I know some people might find the thought of cuddling a sibling weird but I don't. Now I never got aroused but I think it's nice and relaxing to hold a warm person who you know loves you more than anything next to you. And when she's asleep and I'm holding her she looks so sweet and innocent and it makes my heart melt. But latley I started seeing this girl and as our relationship started to get more serious, I encouraged my sister to go to counseling and she did and she started taking anxiety medications. But my girlfriend said that if she's going to stay in a relationship with me, I have to tone down the affection levels with my sister. I told her that I plan on it but these things can't be fixed overnight, but she says I have to stop now or else she'll break up with me, what should I do?

OK, me and my sister were always very close growing up and she was always such an emotional, sweet and caring person. When she turned 13 I remember my parents were worried that their sweet little girl would turn into a hormonal teenager but that never happened. There were no fights and she kept her child-like innocence even in adulthood. She always did have a fondness for children and animals and would break down and start crying whenever she saw somone suffering. But 3 days ago (she's 22 now) she called me on the phone saying that the previous day she had been raped. I tried to console her on the phone but then she asked if I could come over to her appartment because she didn't want to be alone and "hold her". Now I know that you should avoid physical contact with rape victims whenever possible and I didn't want to run into any awkward instances so I just told her I couldn't because I had to take care of something. That night at 2:00 in the morning she called me again this time sobbing more heavily and asked If I could come over there, cuddle and sleep with the bed with her. Now that woul already be highly innapropriate behavior for siblings not withstanding the present circumstances. So I again just told her I couldn't. The next day she called me and this time she was weeping so heavily her voice was incoherent so I just hung up. She tried calling me once yesterday and twice today but i didn't pick up because I just don't know what to do and I'm not sure I can deal with her in this kind of state. What do you think I should do. Do you think if I just leave her alone she'll sort herself out? And do you think that she asked me to hold and sleep with her because what happened to her some how advereley effected her psychology? I just don't know what to do because I hate to think of her in this condition :(