I share the same wish /expectation.
I am so done with uncomfortable age gap or grooming relationships in many Japanese Stories.
The chapter 5.5 have a page that the mc is grownup/age a bit and u can see her with the half demon and a baby
Im scared at this too (´-﹏-`；), i just hope that it's either the half demon child with his prev partner and not the mc's, or like somehow they adopted
But it looks like a spirit, i hope tho.
Oh PLEASE let MC and the half demon dude stay as a father daughter/brother sister type of relationship and nothing more