How to get rid of an annoying, underage crush? Any way to not hurt her feelings?

I'm 21 and she's 13. She's my cousin's girlfriend's little sister. I was hanging out over their house a couple weeks ago and we were all talking and watching TV together. I could tell that she had a little crush on me, but I thought nothing of it. But ever since then, this girl has been hounding... show more I'm 21 and she's 13. She's my cousin's girlfriend's little sister. I was hanging out over their house a couple weeks ago and we were all talking and watching TV together. I could tell that she had a little crush on me, but I thought nothing of it. But ever since then, this girl has been hounding me. She got my number out of my cousin's phone and has called me almost everday since then. She also lives just two blocks away and followed me home once. I'd talk to her about nothing for a few minutes just to be nice, but then she told me she wanted me to be her first boyfriend. I told her it was impossible because of the age difference and to stop calling me, but she kept calling and showed up at my house again when I wasn't there. Her older sister says she's a really sensitive and lonely girl, so I don't want to hurt her feelings. But I can't have this girl calling me and showing up at my house. What should I do?
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