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			If the both of you are just looking for sex and you know where ach other stands, and you're 100% cool with the situation you need to tell your sisters that you appreciate your concern, but there's nothing going on between us and we're just having a good time.  Hopefully they will back off. 
But it seems to me that you don't know where he stands and you're not 100% cool with this situation and your sisters realize this and are just looking out for you.  They don't want to see you get hurt. 
I definitly think you should talk to him, find out what he's looking for.  If it's not something you want or are uncomfortable with.  GET OUT!!  I can't stress that enough.  You're only going to wind up hurt.
		 
		
		
		
		
		
		
		
		
	
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