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Sirius was seriously practising Chidori normally but it only proved Naruto's point. Chidori always gave him tunnel vision and black spots to even move and that is not full Jutsu.
He managed to create the sparks perfectly, but nothing more. As his usage of lightning is raw, he managed to supply the necessary lightning, but not control its shape.
As Chidori needed both chakra and shape manipulation, he can't get the hang of the second part and the sparks are creating black spots to change it.
He can still remember the red hue he saw around the reaper of that thug. That sparked his interest again and he sat calmly under a tree, far from his fathers' Clone and Loke.
'Think, Sirius. How was the feeling? What did I do that made me see the red hue around that reaper?' Thought Sirius and started concentrating.
He remembered how the thug boasted about his reaper as blood reaper and how he concentrated his full attention on the reaper as if trying to see something.
Then it clicked in. He started to see the thirst of the reaper, enveloped in a red hue as if asking for blood. Remembering that feeling in mind, Sirius concentrated on his right hand, where sparks started forming.
He concentrated more, to get a good view of how his magic is reacting inside him and manipulating the shape of the Chidori mentally.
'Yes,' cheered Sirius as he can see the shapeless form of the Chidori fully without any black spots or tunnel vision.
He launched at a tree far away from him, building up momentum and plunged his right hand into the tree.
"Chidori," said Sirius cheerfully, but to his dismay, just before his hand hit the tree, the jutsu vanished and his hand hit the tree and gave him nasty pain.
"Damn tree. I'll promise to put that hole in you," vowed Sirius and went back to his training. From a tree afar, the clone Naruto smiled joyously at the progress of his son.
Every day, one clone will dispel to report the progress to the original and he is sure this will make the original happy.
Time Skip: 2 weeks
"Dancing Viper," called Loke. He created several chains, which he manipulated and hurled towards Naruto. The tips of the chains manifest into snakes' heads, which then attacked Naruto from multiple directions at the same time.
Naruto cast a light barrier silently and the viper heads just bounced off the barrier, not harming Naruto.
"Shooting Chains," said Loke. He created a weighted chain that extended towards a moving Naruto. It is strong enough to break through multiple trees without losing speed as well as it chased the blonde.
Naruto outran it without much trouble. Though he is a clone, he is strong enough to take a B-class mage. But his speed and agility were with him even though he is just a clone but not power. Seeing it is going nowhere, Loke changed his attack.
"Chain Rain," said Loke and many chains started falling around Naruto like rain. Though they are numerous, they are slow, which became useless against Naruto.
"That's it." Said Loke, adjusting his glasses.
"They are good. Are these all the spells the book had?"
"No. There are some more, which I'm going to learn. They are just normal stuff," shrugged Loke and Naruto nodded.
"Let's check on Sirius. I think he is done with his training as well," said Naruto and walked towards the clearing where Sirius was training.
"Chidori," they heard Sirius say and what they saw amazed both of them. Sirius was running towards a tree with not one, but 2 Chidori in both his hands.
He impaled it into 2 adjacent trees and they were clearly cleaved in half and fell without any pause.
Sirius heard clapping and turned around to see his father and Loke. But he noticed something different.
"Papa?" He asked and jumped towards Naruto. Loke was confused by this. He is the same Naruto he was training with, he didn't understand what's the change now.
'When did you return, Papa?'
'Just know, Siri.' Replied Naruto through telepathy. The change between the previous Naruto and this Naruto is that this Naruto is the original while the clone was in the original's place.
After that, Sirius chatted happily with Naruto and Loke. After some lunch, they all walked into the Guildhall to meet with other members as it's been 2 weeks since they went there.