My mum did a similar thing. When I was little like 13 or something, a male friend of mine came out, and his mum told him not to tell his father cause it would kill him. So my mum said to me if I ever needed to come out I wouldn't even have to bother, just be exactly like I would if I was bringing a boy home.
So that what I did. My first real girlfriend stayed over and my mum was like shall I make her breakfast, do you need me to get rid of her.