I'm really traumatized 26 year old guy I have aspergers.

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I'm really traumatized 26 year old guy I have aspergers. Socially awkward and to this day never had a girlfriend. But I've had the strongest crush on my older sister for years.
My mom and dad favored her and my older brother. My parents never had much time to hang out with us. But my sister who was 5 years older than me was my hero. She taught me how to play video games and ride a bike. But nothing ever sexual happened between us. I don't feel she knows about how I've been secretly in love with her for years now. In my childhood 2 incidents happen that make me feel like I was "cuckolded" by my sister, I'll call her Caroline.
First was the most traumatic. I was 11 years old and Caroline was 16 in high school. I heard what I thought was her screaming in her bedroom one night but she really was having sex with her boyfriend. I rushed in to try and help her but the boyfriend started attacking me and beat me up. Caroline was embarrassed and yelled at me to get out of there. I never talked to her about it since but it really hurt me. It's also what started my sexual feelings towards her and unlocked a repressed memory.
When I was around 9 I remember a time when I caught Caroline and my brother naked together in my brothers room. Apparently they had been showering together after going swimming. This has lead me to believe they were sleeping together. My brother was 17 at the time and Caroline was 14. He's the opposite of me an alpha male that gets all the girls. Looking back I feel jealous at my brother and the boyfriend. I feel "cuckolded".
To be clear I don't want to be cuckolded in real life but it's a fantasy I'm curious about. Why does it turn me on to be sexually teased by my sister? Is it because I'm a virgin at 26? Is it because I transferred an Oedipus complex from my mom onto Caroline but it's happening in my adult life instead of age 4 like most guys? Should I talk to Caroline about this?