Put you butplug in, maybe that will give you some inspiration.
I want you to try to deepthrouth that dildo. I want to see you gag. Take the dildo as deep as you can. Try to stick your tongue out. And then try to swollow the dildo in.
Do that 5 times. Make sure you get it deeper every attempt. If you can't do that, hit your balls 3 times with your fist.