You want to go further, don't you. I bet you watch gangbang porn where the girl has two or more cocks in her ass at the same time, only you wish you were the girl whose asshole is being permanently wrecked.
Let's try it then. Take out those three fingers that were just violating your asshole and stick them all the way down your throat. Keep them there until you gag uncontrollable, coughing up spit all over yourself. Then, add your little finger and try to stick all four fingers as far down your throat as you can.
You should see yourself trying to throat fuck yourself with fingers that were just inside your butt! Is there nothing that you won't do? Are you not embarrassed to be a guy who will stick multiple fingers up his ass and then down his throat?
Since this turns you on so much, go on and stick all four of your fingers inside your asshole as far as they will go. Once they are inside, try spreading them wide. Try to feel all of the different corners of your anal cavity. Violate every part of your hole for me.