Upstairs / Downstairs

I was working on my research when the phone rang.

“Where are you?” N asked when I picked up.

“At home,” I said. “Where are you?”

“I’m downstairs.”

“Downstairs where?” I asked.

“Downstairs at home,” N explained.

“Whose home?” I wondered.

“Our home. Where are you?”

“I’m upstairs.”

“Upstairs where?”

After that, I finally went downstairs and we met.