A Subordinate Insect entering another creature's body does not guarantee a 100% successful parasitism.
Instead, its success depends on a comprehensive assessment of the target's Spiritual Power, sanity, strength, and other factors.
Whether the host is a low-intelligence insect or a highly intelligent human or Insect-man, the body will instinctively fight back against an "invader."
The parasitism is only considered successful when one side completely overwhelms the other.
All Han Ning and the All-Encompassing Spiritual Silkworm had to do was continuously drain Aketu's Spiritual Power and weaken his will to finally achieve a successful parasitism.
Fortunately, Han Ning had killed all three of Aketu's Contracted Soul Beasts, severely damaging his Spiritual Power. He was now in a state of mental enervation.
