As this is a casting, we are going to need to test your ass to see just how fuckable it is.
There, take the nearest cock, give it a quick blowjob and then stick it in your ass. For the next minute or two, have that cock slowly fuck you to spread open your hole.
As we do this, we will have one camera filming the cock going in and out of your ass, and another camera filming your face, to catch your reactions to you being fucked. You should look into the camera from time to time, so that we can see those moments when you feel ashamed, in pain or aroused.