Fics like "How to Raise a Brat" by Ryoumen Sukuna

After defeating the best sorcerers, Sukuna reaches his goal and becomes The Strongest again. Decades pass, and Sukuna finds himself feeling… dissatisfied. No one resists his power. Both humanity and curses fear him equally. With surprise, he realizes that the times he deemed boring were in fact the most entertaining ones. He strangely misses fearless fools who were full of determination to fight him, even if it was pointless. His life becomes a boring routine, which he slowly starts to despise. One day, the King of Curses comes across a child with familiar markings under their eyes who reminds him of his vessel a little bit too much, and he does the only rational thing to cure his boredom. He adopts him. Or: Glimpses of Sukuna's attempts at raising a kid who is the reincarnation of his previous vessel, the boy being reborn in this world with a purpose.

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