In truth, the reason she did not make a pact with the Beast King Qing Xu herself, besides her deep love for her child, was due to her fear. She worried that if she interacted too much with this monstrous beast king after making a pact with him, it might upset Xiao Chifeng and cause conflict in their relationship.
Even if the Beast King Qing Xu was remarkably powerful, it was not worth risking her relationship with Xiao Chifeng.
Upon hearing their mother's reassuring words, her three eldest sons felt much comforted.
Indeed! Their mother loved them so much, she would always think of them and wouldn't forget about them when it came to beneficial things.
However, opportunities to form a pact with such a king of divine beasts were rare, so they had no choice but to wait patiently.