First of all, the calling someone brother/sister who you aren't related to is just stupid, and weird tbh. Second, you don't know that he is scared of anything, since, of course you haven't actually ASKED him. You are doing the classic female move of presuming to know what he thinks, and how he feels.. which is a recipe for disappointment. He doesn't want anything more than sex and "friendship", or you would definitely know it.
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No never unless he's mentally warped. Guys just don't normally do sexual things with their sister.
I think it is kinda friends of benefits thing. In my opinion if He really wants a relationship He will pursue after that although He is afraid. Not to to hope any romantic relationship with this guy will be great for you. He wants both friendship and physical things not more.
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It would be hard to call her sister
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