You know I read the trigger warnings and the comments... yet still wasn't able to predict just how bad things could get for this MC.
I can't say I'm really into torture/horror porn as a genre, I often find the story feels lacklustre and explicit just for the sake of it which takes away any impact the content could have, but here I was riveted from beginning to end. You said the writing here is emotionally charged and I felt that throughout, and the way you were able to balance gore, emotion and even eroticism without it feeling like cheap shock tactics shows that you're a seriously talented writer. For as simple as the scenario is there is incredible atmosphere throughout that kept shocking me with how creative each and every ending got. Even the pet ending was terrifying because it's not clear what being a 'pet' entails here, for all we know it could be way worse than anything else she suffered. Friedrich really did steal the show, I love how unapologetically twisted and cruel he is while still somehow being entertaining, while the amount of times he caught the MC and dragged out her death gave him this almost unstoppable force of nature vibe. It really felt like there was nothing you could do to get away no matter what you chose, which made the final ending even more of a shock. I also like how the MC slowly revealed little bits about her personality and backstory throughout, and how it always seemed to be the small moments that broke her more than the violence itself (All's Well That Ends Well in particular was heartbreaking). The art is also just gorgeous, with even the most explicit CG straddling the line between horrifying and haunting, while the character designs are incredible. Again Friedrich stole the show here as well, he is so expressive I love how his body changes at times to show his more demonic side while still keeping that expressiveness (now that's a 'hear me out' even I can't explain).
This was both an unsettling and thrilling little story that I enjoyed way more than I expected to. I'll be keeping an eye out for any future games of yours, and I'd definitely love to see Friedrich make a return.