Why does he look at my ass so much?

Been catching my crush starin at my ass several times. He flirts with me many times. as well. Im petite so im not that thicc hehe. I have a bit of ass for my small phsique. Why does he look there so much? I also caught him looking at my crotch and lips when i was talking to him once.
Why does he look at my ass so much?
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