The transition may have already happened; it sounds more like it's a question of when you decide to label it. I, being my wonderful insanely explicit self (explicit in the "this needs to be clear" way), actually asked my boyfriend after our first 'date" date: "So, does this mean we're dating?" To be fair I prefaced this by saying something like, "I'm an idiot and can't tell these things," (not verbatim but I do think I used the word 'idiot' in my self-description. Possible "Social idiot"). but I'm not sure if that would work with anyone else. I just have the willingness to sacrifice dignity to eliminate confusion like that.