Uh, Grace, if Yuki can't manage to retire from the assassin life as a maid to some no-fame pleb in suburban Japan, how likely are you to remain untouched as a super rich celeb in Santorini?
I like how the mangaka actually acknowledges that, yeah, this is a common thing in dealing with the brother. This has happened before and people are aware of the situation. It's a nice change of pace.
Sooo...her mom wasn't always like that? She used to look older but now looks like she's in elementary school? Which would mean that her dad didn't marry her for being a legal loli. There are entire worlds of awkwardness here.