Earlier I went up to her an playfully tapped her head like a drum. She got up and elbowed me in the back. Then we did the "stay out of each other's reach" dance until I accidentally backhanded her...pretty hard with good contact in the vagina. The reason I think I'm not the asshole is because she got me decently in the balls about 5 seconds later. I will admit hearing the "thump" I made, required instant apology. However during said apology was when she got me in the balls.