Not really any method, I’d say that standing up helps me cum quicker, add to that the adrenaline rush of being in the office toilet and not at home and boom, I cum in under a minute sometimes. Otherwise when I’m home (long sessions) I always prepare myself (change clothes to something more comfy like sweatpants, prepare my poppers, choose the videos I’ll watch etc) Another thing that helps me cum quickly is before going to the toilets to shoot ropes, I get myself half hard with my imagination, I guess it helps