You have an attraction to him right now but I don’t feel that is on his mind. You have charm and see that you could win him over. I would keep with your initial idea of not rushing into it. Do it in more subtle ways like striking conversations at convenient moments. Really turning on your charm. I don’t see a threat to your work environment because he’s real laid back and easy to get along with so don’t be scared to talk to him whenever you get a chance.