The mini-story: Don't trash-talk about your roomie, especially if she might overhear. :)
I prefer to do a basic chair-tie the first time I tie up a new gal. This gives me a chance to watch her face and reactions as I chat with her, while tying. I do this because once in a while a scared or claustrophobic lady will attempt to do bondage modeling, and you have to watch and decide whether she's really going to be able to handle it. This was Erica's first tie-up with us but she seemed quite relaxed, so we've done several tie-ups with her since then.