How do I get her out of my head?

I'm very, VERY attracted to my older sister, and I need that to stop, it's driving me crazy.
I'm 20, just starting college, and moved in with her a year ago because she lives near my campus and she needed a rommate, so it was a win/win situation. She's a 27 year old angel with a gorgeous face and personality, single and popular, very interesting and tits like you wouldn't believe (ever seen Siri, the porn actress? Kinda like that). I used to say all these things in a platonic sense, until a week ago.
We constantly communicate about each other's plans for the weekend. I'm very aware she dates around, which I'm totally fine with and is none of my business anyway, so she likes to know when she has the appartment to herself. Last weekend I was supposed to go camping with some friends, but a combination of bad weather and sudden homework ruined it, so I stayed in and didn't bother to tell my sister. I was just focusing on getting my homework done during saturday night when I heard the door of the appartment, figured she'd just come home and that was it... but then I heard moaning.
You know you shouldn't, but you want to take a peek... so I open my door a little and I see my sister pinned against the wall, tits out, while this 40-something guy fingers her. She's roughing her up and she whispers "rape me like a whore".
They moved to the living room and proceeded to have the kind of sex that you only ever see in hardcore porn. Among the things I saw: the guy fucking her face and then cumming right inside her throat, then pinning her face against the floor while she gasped for air and demanding she say thank you. Or giving it to her very roughly from behind and choking her if she came "without his permission". And she did cum many times...
Most people would be horrified by watching their sisters treated that way... what disturbed me is how turned on by it I was (I knew it was consensual, rape role play). I found it extremely sexy to watch her cum (and very surprised that she enjoyed that kind of sex). The allure wasn't just in watching her naked body, but in witnessing a woman enjoying herself so freely. She was loud and it was messy, but so beautiful when she orgasmed.
The guy got up after cumming for like the fourth time, called her whore and left her laying on the floor with all the sweat and spit and cum. It was gross and hot at the same time. He left and my sisterslowly got up like it was nothing, picked up her clothes and locked herself into her room. I jerked off like a monkey all night afterwards.
Next morning, knowing how messed up the whole place was, I took some food from the kitchen and just had breakfast in my room. It was early, so I didn't expect her to wake up so soon... but I was wrong, so in she comes recently showered, wearing a top and shorts with no bra, casually asking why I was home and now away. I just made up an excuse that my friends and I didn't take the trip and just hit some bars instead.
And then she just asks out of the blue: "Did I look hot last night?" I'm obviously baffled, so she continues, "I know you saw everything. I don't mind. I also don't mind if you find me hot. It's kind of a turn on".
She locked herself inside her room and I haven't seen her since, as I've avoided her like the plague because I don't know how I should feel about this. I can't see her only in a platonic sense anymore, which is fucked up, because she's my sister, but a part of me wants to do to her some of the things I saw... Was she flat out proposing that? What would you do? Would you go ahead with something like this?

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