At that request Kakashi inhaled sharply, but.. stealthily managed to mask the reaction as a slow sigh. Telling Kushina that he'd given Karin two puppies that needed to be both voice trained and people trained could only resort in turmoil, and he'd had enough of Kushina screaming at him to last him a life time.

"Ah-ha, sure.." he lied convincingly. He had no inclination to tell her anything face to face for fear that Kushina could rain her wrath down upon him and potentially stop Karin training with these summons. It was probably selfish, but he didn't care.

...Maybe when she wasn't his boss and wasn't holding his books to ransom. Maybe.