Guys, if you think of a girl as a "sister" would you still check out her boobs?

I have a guy friend who claims I'm like a sister to him and just a friend but I saw him check out my boobs today. Would you still check a girl out that you werent attracted to?

Is it just a "ooooh!!! boobs"! Kinda thing?
Guys, if you think of a girl as a "sister" would you still check out her boobs?
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