My twin sister and I became closer than ever (PART 4)

For reminder, I'm M20 and she's F20. I previously said that after I confessed to my crush, we got into a relationship. And one day, my sister comes in and says we have to train more.

We got into some sort of fight, maybe one of the first one. My argument was we're blood related and she's insane. Her argument was that she's doing this to help me so I don't go through relationship heartbreaks like she did. I kept saying this shit was incest and we can't do it. And she kept saying it's not incest, from her pov, it's siblings helping each other out. I asked her, "do you think other siblings do that?" and she replied, "because they don't love each other as much as we do!"

and something got into my head. I understood I've never had a sane relationship with my sister, she was just this hot version of me walking around the house and I kept having a boner. So instead of calming myself down, I got angrier almost physical, I told her to get the f out my room. But she got physically angry too, and somehow stronger than I realized. She pinned me against the wall (we're the same height) and she grabbed my throat. I grabbed her throat too. It was the first time ever we got into a fight.

We just stared into each other's eyes for minutes (she really is someone dominant) and she whispered "I'm not telling our parents but I know you always had a boner when I'm near. Do you love me and trust me?"
I replied, "I do"
She then said, "I love you too (my name)", and she said, "You're right, we're not regular siblings. I keep getting wet thinking about you"

That shocked me, I asked if she's jealous, but she replied, "I'm not. I just want to help you"

We closed and locked the door, she pushed me on the bed, removed her jeans, and grabbed my throat with her lips on my nose ....

(Part 5 later)