(Time skip)
3 years later
A lot have happened in these three years
I was stuck in an marriage contract with
rias Gremory much like the original story marriage contract was signed by both the familys other then this I started training doing all kinds of excerise like push ups sit ups and squad's full one punch man workout with more repetitions
Riser while doing sit ups (in mind ) :- i started this training at this early age because almost all the devils never do training or workout there entire life and this gonna give me an advantage over them and combining with my Phoenix regeneration
I gonna be unstoppable in the future

Riser (in mind) :- this gonna completely work if I was in an real and logical world
In this world people get boost in there power by thinking about boobs for example when issei was fighting against vali at the peace meeting vali was much stronger then issei and combining with his half Lucifer blood was completely unstoppable for issei
But still issei almost manage to defeated vali with the power oppai this doesn't even make any sense
Riser (in mind) :- I need some kind of scared gear oor more specifically boosted gear or divine dividing or may be both so I have to find a way to get them
Time skip
I was in the library searching for many hours now but unable to find the book which I need
Then I grab few books which grab my attention I grab them and started reading and learning them

After 3 hours someone enter the library but I was busy in reading and learning from the books I grabbed earlier that's when someone from behind me called me
??? :- what are you doing here riser
I turned back I saw lady Phoenix or my mother she was just behind and starring at me
Mother :- "Why do you want learn all of this?" She asked, gesturing at the books scattered around me, their titles ranging from 'the art of war', 'scientific principles of entropy and its relation to nuclear physics', to a few less scientific tomes with titles like 'methods of flame calling to annihilate thine enemies', and one simple black tome with the title of 'Necronomicon and many other books on magic and many books on sacred gears

I looked at my mother for a few long moments as I gave her question the consideration that it was due before finally taking a deep breath and speaking
Riser :- "I need to get stronger In the next seventeen oor eighteen years, so that I will became the young strongest devil of this generation and can make my mother and my family proud and when I face any problem or any danger I needed to be ready to protect my mother and my family and even the underworld "
Riser (in mind) :- please buy thissss please i was praying that my mother buy this made up lie and she did
my mother hug me tightly bless her soul, she told me that she was really happy to have me as her son and just looked at me silently for a few seconds before nodding and pointing me in the direction of a few new books, and making me a promise, that when I became a High class devil, and if I still wanted to become stronger, she would teach me.
I was really happy but I look at my mother and said
Riser :- mother I want you to hide this from everyone about my training and about my power
Mother with worried expression :- why my son
Riser :- because mother if everyone knows my power and how I am they gonna fake themselves in front of me and try to fool me and take advantage of me when I let my guard down
My Mother looked at me silently for a few seconds before nodding and she said
Mother :- it's your wish son do as you want I will always gonna support you and always gonna be in your side
I hugged her and she hugged me too
Riser :- love you mother
Mother :- love you too my child
Time skip
Fast forward another few years, and I had grown by leaps and bounds, While I was at the high level of a high-class devil for a being of 6-7 years old this a huge thing because the strongest young devil Sairaorg Bael was at low level of high class devil
My two older siblings and my father were surprised at my rabid dedication to the Phenix family magics and my training , but eventually just Shrugged it off because they can't feel my full power because of the seals my mother put on me on my request so that I will look like normal devil boy
Ravel has been born now she was about
2 to 3 years old and she love's to spend time with me but i can't spend a lot of time with her because of my constant training but did play with her at night and read her a story book at her bed time
Time skip
I was 9 now and I was at the low level of ultimate class because of my constant physical training and because of my Phoenix regeneration I was able to keeping moving forward and never faces an injury or anything like that the Phoenix regeneration keeps regenerating my body at the times of need and my magical training with my mother help me to pass and break thought high level of the high class and I was now at low ultimate class mother placés an seal on me so that no one can feel my power and tomorrow was special day
I was in the kitchen with Ravel as I was making Ravel some candys Ravel look at me and ask
Ravel :- brother tomorrow is an special day you gonna get your own evil pieces can i became the first member of your peerage she said to me as she was blushing
(Evil Pieces, also known as the Devil's Pieces, are a set of 15 chess pieces given to High-class devils to increase their ranks by reincarnating other beings into Devils.)
I was shocked when she asked me that question but I smiled at her
Riser :- of course my lovely sister you will become my first peerage member if you wish as your wish is my command
I smile at her

Ravel hugged me and says
Ravel :- thank you..thank you... Thank you so much onii-chan
As I hugged her back and says

Riser :- it's alright my dear sister
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Next chapter :- evil Pieces