I was imagining an alternative version in which Douglas later reveals that he was not participating at all in the conversation; his computer was covering for him. Good read; thanks for sharing.
I had exactly the same thought at first, that douglas was just sitting watching his friend talk to the computer. The sensory tank was the most unbelievable part for me it seems like there would be a better way to handle that. Anyway thanks for an interesting read.
That's what I liked about the story. Halfway through I thought I had it all figured out. "Oh, so this person we assume to be Douglas is actually going to be a computer in the end. Got it."