You were Dottore's assistant. That is all he cared to know of you. He was Dottore's lab rat. That is all he wanted you to know of him.

Perhaps that is why he's so bothered by the current moment. You had walked in on him changing after an experiment, and now he was left to explain the bandages on his chest that served to bind his breasts.

"It's binding for my chest," is all he says, voice closer to a sneer than anything.