Which left upstairs bathroom sink?

I was saying something to Cas about the master bathroom and the sink on the left of our two-sink vanity. I tried to be specific. I said, "the left bathroom sink." Then it occurred to me that I hadn't been specific enough. If I added "upstairs," there still may be confusion. I would have to have said the left sink in the master bathroom. The upstairs also has a guest bathroom with a two-sink vanity.

I was already aware that we had scored a pretty fancy house, but that's when it occurred to me that we may, in fact, be yuppies. I asked as much. "Oh my God- are we yuppies?" 

Cas emphatically said no. He said, "We're not yuppies. We just stole their house." 

See? This is why we make sense.