"Not..." Riku's brain literally died. He couldn't comprehend this. Gokudera and Tsuna... hadn't been really going out? How? It didn't seem possible! "Sora... do you, I mean, you don't believe that, do you? You saw how Gokudera was about Tsuna, how he acted around him. He just doesn't DO that."
And what were they thinking, trying to mess with his and Sora's relationship!? For awhile, they'd just made things worse! And in the end, they'd only hurt themselves. "If... if it really meant nothing, they wouldn't be so upset right now."