They didn't hide in broom closets. However, no one had ever seen them kiss, either. They were always together, walking together, holding hands between classes, sitting together in the common room or the Great Hall, or studying together in the library. They were the same as they had always been, inseparable, and seeming to communicate without words.
After two overly hormonal teenage boys, and with another teenage boy coming along, Draco wasn't sure whether he was relieved or worried.