They r all so dum </3
Seriously though, my take here is more that Mika is playing wingman for Noa, trying to push her to realize "if Rihito got with another girl for real, it'd break her heart. In a more concrete sense than normal.
Also this was one of Noa's funniest delusions yet. "What if...
Thank you for your hard work in bringing us the conclusion of this series. Lots of thoughts and feelings but I'm keeping them to myself. It was always an interesting read and I'm going to miss it.