Pace yourself.

You keep things low key, laughing about the drinks and only referencing it to keep the girls drinking a few hours in when they are past their usual two drink limit. After a while you notice the girl's start touching each other and make your move "Hey all of you are quite close but I haven't really had the chance to be..." you think for a moment pausing for effect but then really forgetting how you wanted to phrase it exactly, damn booze. "Well I mean really... like personal you know?" the girls are nodding, guess it has it's upside too. "so I was thinking we could play some getting to know you games, sure you all know each other but it will give me the chance to catch up."