Let me give you a more kindhearted reply, because I'm in a rather good mood.
Small disclaimer:
I can go on my usual rant about how one shouldn't use sexual assault willy nilly and how it is usually better to show as little as possible when you write a rape scene, especially if you want to cater to a bigger audience. You know, keep in mind that this stuff can always be traced back to your in-real-life name blablabla. However, this a small hobby site, so you don't have to worry about making it palatable to the general public.
The main gist
BUT if you still want to do an edgelord work, then (like other people in the forum have said) GO ALL OUT. "Kill and rape" is the most boring way to depict the most vile stomach churning crimes that only a deprived human mind can commit. Give it a little more flare, give me an elaborate description about how you raped every person on the boat, what your victims' last words were, how they reacted when you shoved your junk in them. If your goal is to make it as disgusting as possible, then you have to commit to that goal. If I'm not feeling nauseous after reading your work, then it isn't doing its job. (I've honestly read better fanfiction than this.)
One great example of you not going far enough is already shown in the first scene. It was only casually mentioned that you slapped a girl's ass. However, we don't get to see the protagonist's thoughts about this act. Why did he enjoy it that much, was he enjoying it at all, how often does he do it to her? We don't even get to see the poor girl's reaction.
You know, you can make the edge even better if the protagonist does harm to characters we may actually care about instead of cardboard cutouts. I don't know, make him force his closest ally to rape his own child or something, because that ally decided to betray him for a higher position in the court. Be creative my man, context matters.
Some extra pointers
P.S Don't forget to PUNCTUATE your sentences. It is really bothering me. Also, for heaven's sake, we are not all Americans in here. Please don't botch European languages for comedy. It's not even that funny.
You even have a fun little article to read: Endmaster's map for (im)mature story writing. Might do you some good!