My Sister Is a Lucky Star, but My Words Come True

I have a jinxing tongue. Whoever I talk about ends up having bad luck.

She’s a lucky charm, and everything she wishes for comes true.

The System insists on binding us together. When I have bad luck, she suffers too; when she gets lucky, I benefit as well.

My older sister told me, “Say one careless thing and I’ll kill you.”

I said, “Sis, doesn’t everything you wish for come true?”

She smiled. “Exactly. So you’d better behave.”

Later, I discovered that whenever I said something to protect her, my jinxing tongue turned things around for the better.

But the System said there was a way to break the bond: we had to truly fall in love.

We looked at each other. “Can we have a different condition?”

The System: “No.”

My sister: “Then shut up.”

Me: “...Yes, sis.”