Daddy's Little Girls

I'm going back to Cali in August for 5 days and this trip will include a day excursion to Catalina Island. Chris took a couple of days off so we can go seadooing. Anyhow, as a single daddy of two little girls, he gets the girls from Friday through Sunday. I'm not sure what the proper protocol is, but I do know its not cool to just introduce random women into your daughters' life when they are so young. I haven't said anything about wanting to meet them, because part of me feels like its too soon, and I live so far right now, that it wouldn't feel right. The other part of me thinks that if I don't express interest in meeting them he may feel as if I don't want to. The question I'm left asking is this: Is it my responsibility to say something or does he determine when its time to meet his daughters?