Girls, how do I convince my little sister not to kick me in the crotch?

Anonymous
I was play wrestling with my little sister yesterday, which ended abruptly after I accidentally kicked her in the crotch. I felt bad but laughed my ass off, figuring her mood would improve later.

Later in the evening she warned me that she was going to get me back with a kick in the balls. Not right away, but when I least expect it.

I've been paranoid ever since. Every little noise I hear, I cover my nuts. I've become very paranoid about leaving them out in the open, for fear my little sis will appear like a ninja and kick them. Every time I see her, she does a little fake-out like she's going to attack my grapes, then laughs.

I'm thinking about investing in a cup. How do I convince my sis not to sneak attack my testicles?
Updates
+1 y
I thought I heard her behind a bush when I checked the mail, but I was thankfully wrong. Getting scared people.
Updates
+1 y
It's over. After a little over 24 hours, I sat on the couch and my little sis kicked my balls. Hurt like hell but what a relief.
Girls, how do I convince my little sister not to kick me in the crotch?
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