Is it weird for your little sister to sleep in your bed when you’re not there?

So I was at my boyfriends last night and my younger sister slept in my bed whilst I wasn’t there.. apparently she couldn’t get to sleep in her own bed, she didn’t want to sleep in the spare room because the cats were there so she decided to sleep in mine instead. I’m 23, she’s 13, is rarely in my room and is always talking about me moving out - is it weird?

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