[It's hard to tell if he's referring to that double meaning joke or Mutsu stubbornly being Mutsu... Either way, he rubs his finger into Mutsu's forehead in the same way someone might smush a gnat, making a face.]
If you're "just thinking", you're being super annoying about it! This is like the kinda thinking people do when they're bothered by something.
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[It's hard to tell if he's referring to that double meaning joke or Mutsu stubbornly being Mutsu... Either way, he rubs his finger into Mutsu's forehead in the same way someone might smush a gnat, making a face.]
If you're "just thinking", you're being super annoying about it! This is like the kinda thinking people do when they're bothered by something.
[Not like he's worried or anything!!]