She kicks your balls

You spread your legs. You don’t know how much more your balls can take. You are surprised they are still intact from the last kick.

“Ohhhh I can’t wait for this!!” Your sister says with a excited look. She is even bouncing.

You see her rub her vag. Clearly your kick did something but from what you can tell nothing that will help you.

“I hope I break one!!” She says while lining up her foot.

She slams her foot into your crotch but missing your left ball. The entirety of her strike is absorbed by your lone right nut. And.. it doesn’t hold up. Atleast not completely. You feel something rearrange inside your right ball along with a nauseating blinding pain. It’s probably not completely mush but something is definitely wrong maybe a rupture.

You fall to your knees and your sister jumps up and down happily, her tits bouncing.

“Did I break one?” She asks

You don’t know if you should tell her. If you tell her she might target it more, or maybe she will go easy on you. But if you lie she might get mad or who knows what?