Random undertale story

A Character named frisk split his soul and give the other half to a friend of his that he discovered while his fifth pacifist run. this friend was named chara. frisk also brought another friend, flowey or if you played the game he is actually asriel, the king and queens son, he brought flowey in a flower pot. everything seems to go great. but does it really? frisk has done a genocide run before, and felt bad for it so he reseted . but during the genocide, he saw Chara not like a ghost but as a human, but still a ghost. frisk saw the true Chara. Chara was a demon. chara's eyes could turn black and drip a strange black liquid. Chara Doesn't do that anymore. and everyone forgave Chara for her past. but Chara doesn't forgive herself she curses herself everyday knowing one day she will turn back into that monster that she once was. frisk hears her curses and her whispers to god about not turning back into the thing she once was.
this book might have language not suitable for young people.