There is nothing quite like a threesome.

Regardless of whether the exchange in the previous pages was a real or imagined flashback it's a pretty big lore drop on Kouhai's actual motivations.

Quietly choosing to settle for less in order to avoid large crowds of strangers whilst maintaining an outwardly cheery & carefree attitude, AND genuinely delighting in the company of a select few individuals is a brand of social anxiety I can personally relate to. I getcha, Kouhai.

Edit: Grammar

And the cat is out of the bag: Kouhai-chan isn't chasing for Douki-chan or Douki-kun, she's in for the threesome secret ending.

Kouhai-chan's :3 face is so adorable; it shows how genuinely happy she is.