One of the reasons knots are fun is to check the grip strength of your ass, wont let go! I try to hang on to the knot, then suck it and knotfucking until I cum. The dildo is a large from Bad Dragon.
So impressive! The moment I saw the canine dildo, I got hard. I've never seen anyone support their body weight holding onto a dildo locked in their ass. Bravo! Impressive indeed. Thank you!