Out of everything... this is what they reincarnated into..

As everyone in demon slayer dies and reincarnates, They all reincarnate as.. CATS?! :O and you and your friends adopted them all..?! They all wake up to you softly and sweetly smiling at them. They immediately notice that they're cats and are adopted by you...

Your stupid goofy ahh twin brother was out and your cousin was with him to make sure he didn't cause any trouble. But all of them are reborn in the modern era as cats?