[It's a bit rude of her but Nariko reaches over to pull at Mikado's arm, hopefully guiding his head to her chest so that she can somewhat dramatically pet his hair.]

That's awful, Mikado! You can't spend all your time worrying about Masaomi! You won't have anytime for your new girlfriend if you're always looking at someone else! That's doubly awful for you since I can get jealous!

[This is all for dramatic, for making Mikado blush and getting under Masaomi's skin a bit, but it's also incredibly fun payback for the both of them being difficult at her.]