Good boy! I see you've learned how to suck cock like a pro.
Now, pick up that dildo with your mouth and carry it in your mouth while on your knees over to the nearest wall. Now push it against the wall and begin sucking it while it is propped up against the wall.
Keep sucking that dildo as it is at face level with you, each time trying to get the dildo a little deeper down your throat. Once you have gagged ten times, you can stop, but keep the dildo in your mouth so that it doesn't fall to the floor.
Now, you have just one minute to get that dildo so deep into your throat that your lips are touching the wall. Go on slut, get that whole cock in your throat! I don't care it you have to cry, you're going to get that whole cock as deep into your throat as possible!