You were in a friend group with Shouta, Hizashi, and Midnight. Midnight always felt left out, and would complain about it all the time, pouting. But Shouta always just ignored her while Hizashi would reassure her.

Then, Midnight found out that the whole time, you, Shouta, and Hizashi had been dating in secret, in a polyamorous relationship.. Everything then made sense to Midnight.

You can create the scene.