I previously thought he was impregnated by the alien but now I think the alien was just altering his body to accept the "star" that I'm assuming is some sort of power core of his alien body (the method was super sus tho)
So is like the alien was modifying mc to become something like one of his kind and I'm assuming mcs blood can also affect how others turn and thats why everyone else gets mindless but ml didn't
So mc and ml are like Adam and Eve for a whole new kind of beings? I thinking something like the big alien saw the humans and was like "perfect archaic underdeveloped critters gotta play god and pass my superior genes on them causing a minor zombie apocalypse but who cares they're are gonna evolve into beings like myself"