My sister kicked my boyfriend in the balls?

Anonymous
I have a 17 year old sister and she hates my boyfriend (15). They got in a fight (just yelling at each other), then my sister kicked him in the balls and he just dropped. He looked like he was about to cry (but he didn't), and I don't know what I should do about him and my sister?
Whenever they are around each other they fight about something stupid. But my sister always starts it. And my boyfriend just defends himself.
... but I think its cause my sister knows he's not a virgin.
My sister kicked my boyfriend in the balls?
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