Banana Deepthroat Training
To get it to go in some more, you can always try moving your head back. It helps if your mouth is lined up with your throat. Don't forget also to push your banana a little downwards (the fact that a banana is bent a little actually helps you learn better).
If you are training for a particular scene try to train already in that position, since it may feel different from one position to another (lying on your back with your head tilted at the edge of the bed is a great position to get facefucked).
While going through this and the next couple of slides, make sure you take your banana out, lick it some more and deepthroat it some more.
Pro's, every time you take the banana out of your mouth, put it in the bowl and scoop up some of that taste.