I was literally thinking almost the same thing, im totally expecting the twin to come back though (wish he wouldnt), and take his place and with the most recent chapter of no condom, yea.. hes Def gonna end up pregnant (its literally a foreshadow) however I didn't think about the ML's grandfather at all, like his existence was kinda wiped from my mind for a sec
Oh I also hope ML finds out the whole story about his twin, and mc's ex.. really hope so
About the grandfather idea it's because I read something similar in a omegaverse and when I saw him I was like " wouah it will be something so similar" and in the story it was something like "my great-grandchild is superior so I want him even if it mean he will be illegitimate because I want m'y grandson to marry the person I want but I don't want to abandon the child that I wait years for" (￣∇￣")
So everything will be fine until the twin comes back and went to marry the ML for xy reasons (beauty, rich, superior trait, jealousy MC,...) and then Kaboum misunderstanding misunderstanding so MC run away will pregnant (and ML never tell him he loves him...). And years later...
Then you have 2 possibilities:
Number one: ML's grandpa is alive and learn its great-grandchild is of superior trait so he want him back but not the MC because not superior trait and grandpa want ML to marry twin to have other superior trait great-grandchild or just because so ML do everything to have the two of them (MC and child) and MC will have no choice because ML's family is powerful
Number two: ML's grandpa is dead so now he can marry MC but MC doesn't want to so he will threaten him with his parental rights and how his family is powerful so he will win but if MC comes back he can stay with his child
Also it's possible that they're mark or ML lost control on his pheromone but worst than before
In short, if you think of some other cliche you can put them under (▰˘◡˘▰) I would like to see some plot that maybe I forgot or didn't know...
(I will still read this because I love to see if it will be different or just I will need to suffer in frustration of no communication（/TДT)/ . Otherwise I love the art!!! I did read the other story of the artist so we will see (≧∀≦))