Please help I'm clueless?

I have been flirting with a guy at work for a while now, and we have definitely developed a close friendship/probably more than friendship. (It's to the point that other people have noticed and made little comments.) We flirt with each other, have the little moments of physical contact (i. e., hands brushing against each other, standing so close to each other you couldn't fit a book between us, intense eye contact; he's checking me out, and other clear physical "reactions" from him when talking to me.) How can I test the waters to see if he would be interested in more without making things awkward if somehow I'm wrong? If he wants more, why hasn't he brought it up?

Please help I'm clueless?
Post Opinion