The moment the fireflies start flickering, it's like they've been transported into a whole new dimension. It's not like Sougo's never seen lightning bugs before, but there's something about the otherworldly flora, the blinking lights, and maybe the fact that Tamaki looks so radiant about it all that just pierces Sougo's heart.

It all comes out in a small gasp. "Tamaki-kun... this is ... amazing!"

And then a tightness in his chest. He has to actually clear his throat to get rid of this tickle. He probably just looks really emotional though.