i got punched in the balls for no reason and my sister says i deserved it

today when I was over my aunties house my cousin wanted me to show my face to her friend I said no and covered my face with my computer she grabbed a pillow and started hitting me with it playfully. I took the pillow put it in between my legs. she said give it back I said stop hitting me she said ok, I give the pillow back she grabs it looks at my balls and punches it. 1 minute later she goes up stairs to eat I look at my sister and say ''did you just see what she did.'' she says ''what.'' I say'' she just punched me in the nuts'' guess what she said guess ''I BET YOU DESERVED IT'' the hell I say'' I don't like you'' she says ''why'' I didn't answer