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What do I do if my younger sister goes to my prom with my friend?

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My sister's best friend had asked me if I wanna take her to my prom next year. Dumbfounded I accidentally said yeah sure. I wasn't planning on going originally but I figured it might nice to go especially if I go in a group with my other friends. Well then my younger sister who enjoys making me look bad had asked my best friend if he would take her! And he said yeah! I told him how I wasn't comfortable with it and all he said was "dude it's not like I'm dating her or trying to get into her pants. it's just prom." but I know if the chance arises he'll try to get into her pants. I can't f*cking trust him. And my sister will make me look like an idiot if I do go and try to have fun. What should I do?