A: If you like him and he showed initiative to spend time with you, definitely return the interest. Do you know how many of us girls wish we had that kind of door half way open for us. :) if that is what you want then ask him, if he is interested in getting together another time, ask him for a drink... more
A: How does he connect with others in the same way? If he only touches your arm when he talks and is not naturally a smiley type person when he interacts with others, I would say it sure sounds like there might be a spark. :)
A: I would choose whatever you feel most comfortable with, a note could be very cute, sexy and mysterious. Verbal would be just as nice if delivered with class. How do you feel most comfortable asking, there are no set rules.