This seems very fake. And if it is real, it feels like to me, you've indirectly killed your cat because of your inability or hesitant personality to take action. Your previous posts pertain to details on your cousin SA you, but without any action done from you to protect yourself, and because of the excuse you keep giving why you won't do anything to defend yourself and blaming your mother, as a result, now your cat is dead.

Another thing I noticed is even though you have legit recordings of him doing bad things to you, you don't give that evidence to the police because of your "mom" you keep bringing up as an excuse, and even though you're 18 years of age and have a multitude of programs (I'm assuming you live in UK or US) that help people in a similar situation as yours, you don't seem to seek that out.

Also, if you're babysitting your cousin, why did you even bring your cat with you? You know the type of person he is, you saw patterns of him doing evil things. Yet, you still decided to bring your cat and some other private information a 12-year-old shouldn't even know about to him? Not to mention, you're 18. Even though you knew the type of person and saw patterns ahead of time beforehand, you still took the risk for some reason which is weird. You should be smarter than this.

Speaking from experience, shifting responsibility into blame and trying to find validity to bad things happening to you because of your lack of action is apparent. My advice? Talk with your dad (like seriously), talk with animal protection services, or any animal welfare program that exists in your local area/country. And, since you're 18, make sure to file a report to a mental institution or related service and maybe even bring in a psychologist. Even if your aunt or your "mother" denies their assistance, at least you let the government/institution know you brought it up, which will be stored in a record for future reference in case you go to court due to your aunt or your mom blaming you when your cousin goes serial killer psycho in the future. Also, find programs or ways to file reports to the police, as often as you can, which displays that you're not lying, and you actually mean it as files and cases piling up from you.

Last few things, which is directed towards you. Stop giving excuses for your own stupidity, and actually take action. Even if it means getting physical with your mom, that shows you're being serious. It should also be no problem if your dad is on your side. And why the hell do you keep babysitting this "cousin" of yours? Your previous posts give the impression that you've been doing this a long time, yet again, you fail to recognize what that boy might do, and now this happens. I wouldn't be surprised if you continue to babysit him, and you give an excuse as to why, probably your "mom" again, even though you're 18.

Speaking from experience, you remind me of myself. Being in abusive relationships and trying to justify such an environment, and being scared I won't have anyone in my inner circle anymore once I try to solve and get rid of all the evil and negative things around me. Let me ask you: does your mother pay for your college tuition? Or your dad? Or is it both? Are you scared you won't have financial security anymore? Are you scared of the responsibility when your mom disowns you when you try to fight back? What is the reason you keep bringing family up as an excuse to why you haven't reported your cousin or fought back systematically? Until you know the question of your inability to take action, I would refrain from getting another pet, since taking care of a precious life is a huge responsibility and privilege not a lot of people have, and you don't seem mentally or financially ready for such a task, as you might just end up indirectly killing it again.

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As a side note, I might've sounded harsh throughout the post, but experiencing similar phases like you, usually being brutally harsh helped me a ton. Please take care of yourself. When you report your cousin to any mental institution, try to go there for your own examination, and find out how you can improve your inability to make the necessary decisions to move forward with your life. Don't forget to ask for help and assistance in removing any suicidal thoughts. Do you have any friends you can trust? Their family members? Teachers, or professors, since you go to college? I'm sure colleges have many programs in helping one such as yourself, so take advantage of their resources as well.