I love how this story is culminating to its peak. It is such a great concept and even though logic is not always perfectly sound, I vibe with it a lot.
It kinda rolls towards to how the WH40K universe became a living nightmare world.
The pacing is moving faster that blood towards your junk. Tbh the MC is probably strong enough to let the demon rest within him, bro just wants to rest. He isnt even evil, so much as he is a power to reach your desires.