Gokudera tried to give the question some serious though. He knew that he'd never forget the first time they kissed. You just didn't forget something like that. But it really wasn't his most memorable time spent with Tsuna. Which was why he was surprised that Tsuna picked this morning. As far as he could tell, there hadn't been anything particularly special about it. But it was Tsuna's strongest memory.
"I think," Gokudera said, "I think its got to be the way you laugh," granted it wasn't very often, "When you're happy." It was something he hoped, no matter who Tsuna ended up with, they'd had the opportunity to hear it all the time.
Tsuna didn't laugh very often with him, so maybe that was another reason it was good that they ended it now.