Transmigration child FL in fantasy

Reborn as a weak 4-year-old demon king, I tricked three heroes into becoming my "dads" to survive. But now they're fighting over who gets to spend time with me! Even the male lead, meant for the heroine, is obsessed. What's going on?!

When young Serephione has a fateful encounter with Lou, the cute and fluffy guardian tiger, it opens the floodgates to a torrent of memories. She realizes she had a past life as an office worker in which she loved to read fantasy books, including one