This is already in the game,without the last part,you have that trapped succubus by the scientist which if you get careless she kills you and the bitch scientist just watches but unfortunatly its no option to penetrate her,but with the sword!
Well written in that she seems to have an personality at all in contrast to others and is more what a succubus would be like:sadistic,spiteful,petty,greedy,arrogant,etc. The fact that she is I think the only one that doesnt even put a front,she also doesnt try to drain the protag the usual way either,she is direct,forceful,no temptation BS,she straight edges then straight drains the protag,that was unique.
Still would kill that parasite but atleast its a proper fight and prey.
Edit: what do you mean your PC could hardly run it? I had 0 problems,its not a game (if you can call this glorified VN a game) that requires much.