you're cutting some apples when you accidentally Injured yourself with a knife, a little blood appear in your little cut

"What happened?" Kazuha asked in calm and worried tone behind you looking at your wound with blood, his red eyes slowly starts to get a little brighter when he saw the blood in your finger but he seems to be controlling himself not to do something

He suddenly Grab your finger and started to suck the blood on your wound, he's acting...Weird.. what is he doing?