Help me /bant/ for the longest time I have had a massive sexual attraction to my sister and it is only getting stronger. I really want to fuck her but I don't think it's a good idea for me to share these feeling with her

Should I seek some sort of therapy? I really don't feel like talking about this with someone. Or should I pursue this and try to see if I can fuck her, because this might not be the type of feeling that will just go away. Anyone else ever have a lust for their sister? I get reallly turned on around her