After Bruce gets heavily pregnant, Clark makes it his routine to stand behind Bruce and pick up his belly and talk to him in his oh-so sweet southern twang that Bruce loves as his way of bonding with not just his precious little princess but also with his wife because pregnancy is not just about the kid.
He continues it even after their baby girl is born and it always happens when Bruce is feeding her and that's how Clark accidentally pavlovs Bruce's body to leak for him whenever he talks to him in a southern twang.
Clark takes great advantage of his new found power.

















