We sit on the floor (my T sits on a cushion). When I first started going, we sat on chairs but I didn't like those and wanted to move to the floor.

My T has recently acquired two couches which sit perpendicular to each other. We now sit on the floor, leaning against one of the couches. I like to sit next to my T, and I refuse to sit next to him on a couch because it just makes me think of two middle-aged people on a date. I have no idea why I think that - it made my T laugh though.