Now you're gonna fuck that dildo hard. Pick a metronome speed and stick to it, but careful; that speed might be what you use later when stroking yourself, so don't go too slow!
http://www.metronomeonline.com/
Keep up the fucking in whatever position for a good 3 minutes, and if you cum even slightly, get it on your fingers and lick it up. (That's the only time the plug should leave your mouth)
Oh and you better be recording this all.