that's basically a rule, where if a character always close its eyes and smiles or have a sunny personality, everything changes once they open their eyes, either they're somewhat hot or shit is about to happen, well that's just what I've observed tho( ̄∇ ̄")
Is this from nhentai? No plot only smut.
Btw Semes eyes scared me to death. I prefer him eyeless its much more safe for me:)