Let's start with your fingers. I want you to get on all fours, suck off your first finger, and then stick it right up your ass as far as you can. For the next minute, I want you to make circles with your finger deep in your ass, trying to pry open your hole as you do.
After a minute, pull out your finger and stick it, together with your middle finger, in your mouth and suck them off for a few seconds until they are covered in your saliva. Once they are, stick them up your ass and proceed to stretch the two fingers apart for awhile, trying to further widen your asshole.
Again, take them from your ass and suck them off, together with your third finger. Can you taste your ass juices?
Get those three fingers wet and them jam them deep into your ass. Alternate trying to make circles in your ass with jamming those fingers deep and fast into yourself. As you do, I want to hear you moan, just like a pornstar who has a monster cock deep inside her pussy.