If memory serves - I had 3 4-hands sessions, the best at Arthur&Paul in Phnom Penn.
There was a designated leader (the more experienced), and #2 following his lead.
They worked both sides, sometimes symetrically, sometimes intentionally not. It was professional coreography, even in the way they first teased and then fit their dicks into both palms. Continued so after the turn over, coordinating the therapeutic and sensual aspects.
It ended in me sucking the bigger dick, while being sucked by #2.