"You are so cruel," Seamus complained, grinning broadly. "It's a wonder I love you at all, really. Ridiculous devotion - worthy of a Hufflepuff." He couldn't even be bothered to act as if he believed what he was saying, not when it was his birthday and Dean had come up trumps with both breakfast and presents. Not that either one was surprising - he couldn't remember a time he hadn't enjoyed a present from Dean.
Seamus snorted explosively - and desperately tried to think up an innuendo as good. "I've never had so many at once," he said, after a moment of concentrated thought. "So your birthday present to me is basically a miniature orgy?" It wasn't a particularly masterful example, but in the mood he was in Seamus found it hilarious, and found his sides starting to ache pleasantly from both laughing and trying not to laugh.