Tsuna smiled widely, feeling relieved and glad he apparently got it right. Apparently, Gokudera knew how to smile.
"You should smile more, Gokudera," Tsuna told the other boy, taking his notebook back so he could work on the rest of the homework.
"I can do that," it was reasonable. "How's the conclusion? Cause I always end up saying some lame stuff that's the same exact stuff I said in the intro." Which was what you were supposed to do but Sora just did it lamely.