YAY on the response from B- it's pretty long aswell, given the text can't have been more than a couple of sentences. Great news!
I'd go with an upbeat reply sharing tidbits about your life, and including the info about the contacts as he can respond to that. Respond in the same tone- friendly, but with a little distance (I thought the cheers at the end was indicative of that- very matey). On the other hand, I think that him treating you in a matey way right now is pretty good- friendship stage and all that! Also, can you include a little response and Romeo and Juliet in some way? He sounds so excited and positive about that so it'd be nice to continue it!
