Your man-hampster is spinning. Don't let any of this concern you. It's rare that girls that don't know each other will talk like that.
In fact, go for your # closes at the end, when people are leaving. This way you won't have to worry about girls talking, plus you don't get stuck in that weird spot where you get a girl's # but still have to hang out in the room for a couple of hours.
Also, don't offer to take any girl out for food that you just met. Get her number, and lock her down for a drink over the phone.
You're showing your hand way too early by offering a sushi date.
In fact, go for your # closes at the end, when people are leaving. This way you won't have to worry about girls talking, plus you don't get stuck in that weird spot where you get a girl's # but still have to hang out in the room for a couple of hours.
Also, don't offer to take any girl out for food that you just met. Get her number, and lock her down for a drink over the phone.
You're showing your hand way too early by offering a sushi date.