HOW DO I HAVE SEX WITH A GUY I DONT REALLY KNOW!!!!

I've know this guy since we were in elementary... in middle school kinda we went to different schools... however I've always had a huge crush... he like athletic really really buff and cute... however when I actually try to hang out with him to get to know him better ....he blows it off and says he rather have me come over to his pad.... we've sexted and I've sent him nude and he sent someback. but he said he doesn't want a relationship which I'm cool with. but I'm not really comfortable or really know him and he wants me to go over and bang me how do I do this ??? please help