It looks like you are really enjoying this, look your cock is starting to leak!
You better clean that up before it makes a mess in here.
I think you sould get as much pre cum out and wipe it on your hand.
I don't think you are getting enough out. Why don't you try milking your balls too? Pull them away from your cock and really squeeze them good!
You can squeeze harder than that! Really pull and Squeeze until more pre cum comes out and wipe it up.