In chapter 729 of トモちゃんは女の子 (Tomo-chan wa Onna no Ko), two characters are negotiating, while other two do the hand gestures depicted in the following image:
By the Giseigo (Onomatopoeia) used here (コンコン - Kon Kon) I deduce it has to do something with foxes (Foxes being described in Japanese folklore as very intelligent and cunning). I have seen the same gesturing a couple of times before (I don't remember where) in the approximately same situation (a character leading another by the nose).
What is the meaning, then, of said gesturing? A reliable source or reference would be appreciated.