(3rd person POV )
Inside the Hokage office , Ren and Kakashi stood before the old Hokage's desk . The atmosphere was lively because just a few moments ago , Hokage gave merit points equal to two A rank missions for taking care of the traitor Mizuki and saving the Forbidden Scroll of Seals from falling into wrong hands .
Ren was of course happy because he was struggling for gaining merit points and they came to him due to a simple deed he did for his own benifit . He had gained Hachimon Tonkou skill and so many merits from just small amount of work . Ren knew that saving Naruto was also a huge contribution to Konoha because he was the jinchuriki of Kyuubi .
After chatting with his Grandpa Hokage for a while more , Ren left the office together with Kakashi and now it was time for the continuation of their important talk from before . Both of them returned to Ren's house and unexpectedly Kakashi came to the point immediately.
" Kid , I would be lying if I said that I had faith that you can help me seal my sharingan because even Jiraya san who is master of advanced seals did not dare to mess with it . "
Ren was not impatient but while he delayed this ordeal with Kakashi, he could not feel comfortable. So he just casually listened to Kakashi talking while inside his mind , he was quietly building the new seal formula which he had named Great Yin Lock Seal . He had already developed the formula for Yin Lock Seal from scratch inside his mind before so now he just had to make it hundred times stronger .
The task may seem difficult but it was actually not because inside Ren's brain , there was too much knowledge about fuinjutsu. So he just had to compile it in a special combination to create new seal formulas whether they are D rank or mighty S rank . Ren only used few minutes of time and completed the new formula because he already had a weaker version saved inside his mind before.
Kakashi on the other hand was speechless because the kid before him was too daring to actually ignore him completely when he was talking about such an important matter . He was glad he did not explode because Ren finally spoke after a few minutes.
" Kakashi san , wait for about half an hour and I will create the right seal to solve your situation in that time . Just dont disturb me because it's a new A rank seal and I do not want to waste precious ingredients used to create it . "
Ren just took out , a chakra ink brush , good quality chakra ink and a small bottle filled with dense red blood from one of his storage scrolls and started the creation process.
After about half an hour , Ren's forehead had some sweat on it but he was smiling brightly as he looked at the strange pattern on the floor which he had written using chakra ink which was mixed with C rank snake's blood which he had stored inside the small bottle from before .
The pattern looked like a small sun was radiating heat waves in all directions. The sun was a small circle inside which a 2inch long and wide special paper used for creating seals was lying . The heat waves were the more than 50 thin black lines which were each more than one meter long . Actually the lines were made up by small kanji characters which he had written using the chakra ink which was mixed with an infant snake chakra beast's blood because it contained yin chakra in very pure form inside it.
" Condense " Ren yelled and the black lines immediately came alive and started rushing inside the small piece of paper. After all the lines dissapeared like they were never written before , only the small circle and the chakra paper which now had strange pattern inscribed on it remained . The seal was finally created and Ren's face was pale because he had used more than half of his chakra in total when writing the pattern using ink which conducted his chakra and finally the condensation process which took great amount of chakra in one go . Ren did not mind feeling exhausted though because he had finally created his original seal and it was a special A rank one at that . Actually Ren's fuinjutsu skill was already at max level so he could create this level of seals using only using his chakra in seconds but the main problem was that he did not have the Yin affinity to create this special seal . Now with the seal created successfully he had also gained rare Yin Affinity which was another good news for him .
Kakashi on other hand had watched the whole process and was already frozen stunned by the otherworldly concentration and fuinjutsu skill which Ren displayed before his eyes . To create A rank seals some masters even take days of time but Ren completed it in just thirty minutes before his eyes . Kakashi could swear that he had not seen such Godly talent for fuinjutsu inside anyone not even Uzumaki Kushina who was a great genius at fuinjutsu.
Ren ignored Kakashi altogether because he wanted to see the effects of his creation immediately so he just picked up the seal tag and stuck it on Kakashi's blood red sharingan without caring about Kakashi's opinion.
" Seal . " Ren sent a little chakra inside the tag through his palm and after glowing for a while , the sealing pattern on the tag dimmed and completely lost its lusture from before .
Ren could not help but laugh in satisfaction because Kakashi's sharingan had already deactivated and his eye ball was pitch black instead of red . Ren strongly felt that he was going to get addicted to creating new useful seals from scratch from now on because this feeling of watching his creation's magic was relishing..