The second best is their knot. Humping is sexy and exciting but never lasts long… but a good tie is the most exciting and satisfying thing I have ever experienced. Especially after he knows you well and is comfortable holding still for a long while…
The third best is his tongue cleaning me up afterward!?
The knot but only if it's a long tie, if not oral, humping would be the best imo if it lastest longer but it always seems to be over right when it's getting good
It's all good, no one can lap a pussy like a K9, it's incredible. But it's the one two punch of taking the knot and the volume of cum that follows and the amount of time it takes him to deposit it is what makes it different and special.