As you are leaning over the bed or the sofa sucking on one dildo, begin fucking your ass with the huge dildo.
For the first minute, fuck your ass at a pace of one thrust every two seconds.
Now add a smaller dildo that has already been in your ass into your mouth and suck off two dildos at once.
For the second minute, fuck your ass at a pass of one thrust every second.
Now add a third dildo that was in your ass into your mouth so that it is stretched as wide as possible by three dildos. That looks so funny and yet so slutty, going down on three dildos that were inside your ass just a few minutes ago.
For the final minute, fuck your ass at a pace of two thrusts per second. When the minute is up pull out the dildo and try to gape your ass by pulling it wide open with both hands.