Ran: Maybe Dad found out Shinichi and I are dating.
Ran: And that's why he's been studying me.
Conan: Oh no, that's bad!
Conan: I was planning to tell Occhan when I got my real body back...
Conan: Hearing it from someone else and hearing it from the person directly gives a very different impression…
~~
Let's talk about how sweet this ShinRan crumb is 💖
That Shinichi's plans to talk to his father-in-law about his relationship with Ran and how much it matters to him to make a good impression to him shows how seriously he takes his relationship with Ran.
He is startled just thinking that if someone else tells Kogoro instead of himself, it could damage his image as a boyfriend in front of his father-in-law.
I love him.