@SoronelA lot of my own writing I do for catharsis, to get the bad stuff out of my head. That's a big part of why I don't have any stories posted here. I don't want these thoughts associated with me and I don't always bother finishing them, but I need to get them out.
What I would do in your situation is write the scene in whatever way makes me feel better, then transfer to the main story only the parts you need.
For example, you could write it as a dream sequence or with the perpetrator getting caught and beaten up afterwards. You could create a framing story where the attack is themselves being blackmail into doing the act. And so on.
None of this is going into the actual story you're writing, you're just treating the writing of this scene like a piece of scratch paper. I'd even go so far as to start a whole new document that has the side story, then just copy & paste the relevant paragraphs into the main story.