Is it normal to have these dreams?

I have dreams about raping my mother. I got drunk one night and actually seriously considered doing it, but i talked myself out of it since i did'nt have condoms are did'nt want my sperm inside her incase she got pregnant. I am too young to have kids just yet. These dreams though really turn me on, the thought of just pining her to the couch and violating her is really hot. I often wake up with spunk in my boxers. She has nice boobs too for being my mother. Is it normal?