Help! looking for a manga

it is either yaoi or shounen-ai, mcs are both office workers, one is blonde (new worker in the company, also has a female bff in the company) and the other has black hair (is a manager or something). the manager used to date the new worker's college senior and they were in the rainbow lgbt club or something in college. Also, people from a different department were always giving the new worker work he wasn't supposed to be doing.