Bb reborn

Demoverse reborn. (Demon) sans is a baby being raised by papyrus. Papyrus is an energetic and fun loving sentry demon undertale with big dreams of joining the royal guard. He loves his brother very much but doesn’t understand (demon) sans isnt the same sans as the o e he had before. He loves cooking and He’s a very kind and gentle guy dispite his incredible strength and always tries to help everyone. during a revive a glitch occurs causing demon to respawn as a baby within a classic timeline, replacing the sans of that timeline due to a multiversal glitch. naturally since he’s a sans too nobody suspects that he’s not the sans of that timeline (timeline disconnected from multiverse. nobody knows about the aus). seeing him as his brother still despite becoming a baby, papyrus keeps him around and after no way of turning him back is found papyrus ends up raising him. by the time frisk falls to the underground (demon) sans is a toddler. except he’s still just as powerful (if not more due to having youth on his side) and just as corrupt. maybe in this au since he trapped chara's ghost within his self in his original universe he could take chara's place at the end of the genocide route. obviously he wouldn't fight the human in judgement hall, i cant see asgore letting a toddler act as royal judge, the fight would be against someone else, maybe it would just be where asgore fights you seeing as (demon) sans would be in the other room. during the genocide run i could see papyrus joining undyne's fight instead of fighting in Snowdin. he wouldn't want to leave (demon) sans alone for his talk with the human which is why he would go to waterfall in the first place. undyne and papyrus could notice the human approaching and tell (demon) sans to go hide. instead he would follow the human (secretly from a distance) all the way until they reach newhome when he would leave while flowey tells the story.