"You're suggesting Tsuna is capable of blackmail?" THAT didn't make any sense.
Sora frowned, since he knew Riku couldn't see it. Riku was really good at sort of ignoring things he didn't feel like bothering with. "Okay...if you don't want to tell me I guess you don't HAVE to," Sora told him, with a secret 'but I'll be annoyed at you'. There was no reason NOT to. Especially since it was about him! Le sigh.