Why did my girlfriend ask if I thought her sister was hot and if I would go out with her?

Anonymous
Yesterday my girlfriend asked me that question and I said yes to both but I did not ask why. Not sure if she was checking to see if I would do anything with her sister or what. Not sure what to think. I been with my girlfriend for about 7 months and everything seems ok so just confused.
Why did my girlfriend ask if I thought her sister was hot and if I would go out with her?
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