HELP...I am going to get caught!

I need help, please put your morals to one side and give me some advice. I go to university in city A and I am seeing a girl A, we are not gf or bf but we sleep together and I do care about her, she is like a sister to me. When away from university on holiday I live in City B and I am seeing another girl B, we have sex and hang out but it is not a gf bf relationship. I don't care for her as I care for girl A. I just found out Girl B, wants to come see me at university in city A for 2 weeks, since her work place has a place in city A as well as city B. Now I am worried, girl B would want to come to my house in city A where I go university and will meet girl A, who I live with at university. How can I stop both of them meeting? How can I stop girl B from coming to my house? How can I show girl B around town and not get caught by girl A? It is a small town and she would know if I go missing for a bit, because she likes spending time with me. How can I have sex with girl B when she comes to city A without girl A finding out? :$

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