My wife humiliated me in front of my sister

My older sister lives pretty far away from my wife and I. This weekend she was back home for a visit with her husband. Growing up, she never racked me. I wish she had sometimes, my sister is a very attractive woman. In fact I’m only aware of her kneeing one guy in the balls. My wife is 5’4, shoulder length blonde hair, d cups, very fit. Sister is 5’10, dark brunette, thin, honestly not sure on her cup size but they’re very big. Much larger than my wife’s.

On Friday night my sister, wife and me were watching a movie where a man inevitably got kicked in the balls. My wife, who loves to hear other women talk about kicking balls asked my sister if she had ever kicked a boy there growing up.

My sister responded with a smile "Not a boy exactly, but I kneed Brad (her husband) in the nuts on our first date because he put his hands somewhere I didn’t want them. My wife asked for more details and my sister responded “well, when my knee hit his balls he jolted upright and kind of fell off the couch, when I looked down at him he was pressing his hands between his legs and moaning. I got up and left expecting to never see him again, but he called me an hour later and told me how sorry he was for touching me like that. He’s been a perfect gentleman ever since”.

My wife then said “Your little brother had the same reaction the first time I kicked his balls”. My sister laughed and asked what I did to deserve that and my wife told her how she just felt like kicking me” Sis got a good laugh out of that.

Then my wife told the story of our first date how I grabbed her boobs while making out on my couch and almost got a knee like my brother in law.

My sister responded with “Wow, you know I never kicked John in the balls growing up, but maybe I should have if he thought touching a girl like that is okay. I’m glad you taught him though.”

At this point I flipped my hard dick into my waistband and went into our bedroom while they talked about busting balls some more.