Disclaimer: The writing's mine, the characters aren't.
Rainbow
"Harry, have you seen my rainbow?" Luna asked him, completely serious and with a rather sad look on her face.
"Uhm. No? What do you mean?" Harry wasn't sure how to respond. There was only so much her could know when it came to Luna.
"I mean, I lost my rainbow, Harry. I was chasing Nargles and I had it with me all the time, I know it. And when I wanted to get it out so I could give it to the Nargles, it was gone. Have you seen it?"
Harry shook his head. "Sorry, no. But I've seen something else."
"Yes, what is it? A Snorkack?"
"No, this beautiful specimen here." He pointed right at her heart. "I'd really love to kiss it."
"Why don't you do it then?" Luna asked curiously.
And so he did.