Some background: I am a software programmer and is responsible for a whole system that is being used by mostly the girl from another department. Since she mostly use a system that I alone handle, we mostly work together on data fixes and maintenance for this system. We were both single and on the same age-range and we are mostly seen by her colleagues together, and that's were the problem starts. Her colleagues tease us (making high pitched noises and say things like we're going out together) whenever I go to her station. At first I just ignored it, but now it affects our professional relationship to the point that we now try to avoid meetings that include just the two of us.
Our work environment have a close relationship (almost family-like) atmosphere, and as much as possible, I want to avoid being a kill-joy to them by being too professional minded. Is there a way to salvage my professional relationship with this girl without being a 'librarian' to her colleagues?