Kisame was happily surprised. He used senjutsu to become aware of all those things. She could sense it naturally? Oh man, oh maaan, this was going to be an impactful meeting. Samehada was going to have a great effect on her.
What the effect was, Kisame couldn't say. Some people experienced Samehada as a black hole. Some experienced the sword as a noise-cancelling headphones. To some, holding Samehada was as if one held a volume slider where music and sound-effects and speech suddenly could be mixed differently. To some, it was as if holding a volume button to the sound of the world, and to some, it was like putting the nozzle of a vacuum on their nose.
"Gheh! Don't worry about overfeeding him. Fatting him up will only make his spikes fatter and longer. If he grows twice his size and heavier for a few days or years, that is fine, I can still swing him around. I like my swords like I like my partners, the bigger and meatier, the more to love."
Kisame said, "Please excuse me for a moment. Let me get my bag so I can dressed." And he stood up. He left and returned with his duffle bag. He opened it, and put down training weights on his upper arms. He strapped them down. He put on a vest with training weights on his torso too. He strapped it down too. These were not usual weights. These were chakra-draining rods.
Mr. Kishimoto's bingo book canonically called Hoshigaki Kisame the _Tailed Beast Without A Tail._ If he gave Samehada to Karin to experience quietude but he did not limit his chakra omitting to a single percentage digit, then his chakra aura would still be as loud as a freight ship horn. Sure, some sensor chicks loved to be flattened by his 'big horn', vulgarity intended, but not everyone liked to be overwhelmed.
Now the rods drained Kisame's chakra, he chose to no longer feed the escesses to Samehada.
The sword noticed immediately. It turned on its tummy.
"Samehada! Come here, pupper." Kisame patted his thigh. "Come here!"
Samehada came to Kisame, but it was grumpy about this.
Kisame reached out to pet it--
Kisame smiled. "Aww, we're not friendly any more? That's because I stopped feeding you my chakra, ne? This is Karin. Karin want to give pets and chakra. Go taste Karin!"