Wtf? ~A Muzan x Yoriichi x Kokushibo Fanfic~

So Heres The Thing, I Can Never Find Any Good Muzan x Kokushibo x Yorrichi Stories, Ok They Are Either Trash, BullShit, Not The Actual Thing, have An Unreasonable Amount Of Grammer Mistakes, are Really Short, And Ect.
So I Took It Into My Own Hands. So If You Want

Very Smutty
Good Plot
Most likely/ Probably What You're Looking For
No Grammer And Spelling Mistakes
Cursing
And A Long Story
Then I Have Exactly What Your Looking For, But If Your Here To Hate On It Then Get The Fuck Out, But If Not Then Welcome, Read As Much As You Want.

Summary:
All His Life, Kokushibo Hated His Brother Yorrichi, But Never The Less Yorrichi Loved His Brother Despite The Other's Hate For Him. It Infuriated Kokushibo How Much Better His Younger Brother Was Compared To Him.
As Time Went By His Envy And Jealousy Only Increased, Luckily For Kokushibo They Were Separated Growing Up, And Kokushibo Continued His Dream Of Becoming A Samari/Demon Slayer, But On One Of His Missions With His Group. They Encounter A Very Powerful Demon, Struggling To Fight The Entity, Kokushibo Lost All Of His Men, But Then A Blessing And A Curse Comes By.

A Few Months After The Encounter, Both Kokushibo And Yoriichi Have Become The 2 Strongest Hashiras (Yorrichi Being The Strongest). Despite The Fact That Kokushibo Was The 2nd Strongest Hashira, It Wasn't Enough. He Had To Be Better, The Best Of The Best, Not Just That But Had To- No. NEEDED To Surpass His Brother, Yoriichi. After A Mission With Yoriichi, Kokushibo Went Out To Do His Nightly Patrol Around The Village And In The Forrest. Where He Encounters, The One And Only Demon King Himself. What Happens Next Is History. Read To Find Out What Happens....