I don't really have a choice of where to sit. T has her chair, then there's a love seat across from her chair..where clients sit. There is one extra chair in the room alongside T's chair...but it would feel awkward to do therapy from there..having to glance sideways.
Once, feeling rowdy, I sat in PrevT's chair just to see what she would do. She didn't flinch...and sat in the client chair.