Well, isn't that terribly convenient?
Also, wouldn't it be really weird a d suspicious for Yotsuha to know that Yae's phone can't type that emoji? Wonder if that'll come up later.
And won't he notice that he doesn't have to type his password anymore the next time he uses his phone? Why didn't she just check his recent messages right then and there? Even if something got fucked up because of it, she'd still carry that info into the past with her.
