You Boss, Who Asked You to Raise the Protagonist?

Lin Ye traveled across the heavens and just wanted to lie down and wait for death, collect protection fees as a behind-the-scenes boss, and enjoy his retirement life. But the [All Heavens Adoption System] bound to him is a sinkhole! Not only did it forcefully buy and sell him, but it also specially stuffed him with the "child of destiny" as a cub! The first one I raised, Long Ao, was born as a protagonist, blessed with good luck, but he was a troublemaker. After raising his wings, he became hardened and ran away without looking back. The second raised Yueling had a deep scheming mind, cut open the black empress, and talked about repaying his kindness, but when he came back, he wanted to empty out all his Void Throne, Source of Chaos, and All Worlds Treasures! I don't know which number it is... Lin Ye vowed never to raise it again, but as a result, another iron-eating "iron lump" was stuffed into the system. This kid doesn't cry, make trouble, or run away, he just... Loves to eat iron! She even gave him screws picked out from the trash as gifts! …