Hermione winced, relieved and embarrassed, and not a little concerned. How on earth did Tonks know that Harry knew? Did she just know bloody everything that went on in this house? Hermione was glad Harry had kept his word, but if Tonks could figure it out then eventually other people would start putting two and two together as well. Maybe that was the best way to do it, actually. Stop hiding it quite so much, and let people realise slowly in their own time – that might possibly be less dramatic than an official announcement. Maybe. She could ask Draco what he thought later.