HELP PLEASE

So there’s this guy I like I’ve known him for a while and he lives only the next town over he “dated” my sister for a day and I’ve always liked him but he asks me all the time “do you like me?” I tell him “yea I always have” then he like “would you date me?” I usually say no because we wouldn’t be able to see each other but he’s getting his drivers license soon and then he can come see me I’ve always liked him and we are both attracted to each other what do I do? Ask him on a date or leave it? My sister says she doesn’t care if I date him but if I do she will change her mind and get pissed help me pls?!