This happened this morning. I was busy on the computer, then I hear the door go and my daughter shouted hello. Panic gripped me I couldn't go anywhere so it was game over. She came in and saw me dressed. But her reaction really surprised me she didn't bat an eye lid at seeing me dressed. I asked why, she said that she goes to university and its quite normal sight for her. We busied ourselves doing our own thing and nothing else was said. I can trust her not to tell as we've got a very close relationship. It was a great shock but we handled it.
