If a girl asks to come to my place and I agree, then she asks if her friend could come too, what should I expect?

So a female friend of mine that I like a lot asked to come to my place this Friday night. I agreed and then she asked if she could bring a female friend of hers who I also know, but not as well. I understand the safety concerns, me being a male living alone, but what could her intentions be so I know what to expect? Thank you!

If a girl asks to come to my place and I agree, then she asks if her friend could come too, what should I expect?
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