Jack did no such thing. Except, no, he did. Particularly when he was sure he was alone in the Hub or the flat and no one would come bursting in on him. Besides, he was the one who was supposed to have the subtle looks of brooding. Rule number one in the 'men who save the world' handbook. And when it came down to it, Ianto was one of the few people who could talk him down from the self-sacrificing ledge. Though, when one couldn't die, Jack wondered how self-sacrificing it really was.
It was only around Ianto that Jack dropped his guard enough to hum or sing softly. Besides, he knew the effect it had on Ianto and, perhaps, he liked using it to his advantage. Turn about was fair play after all. Jack's vocal chords for Ianto's vowels. Even trade.
Jack only gave Ianto one of his winning smiles in response. "They were misplaced," Jack said, attempting to adopt an air of innocence. "Gone and never to be heard from again." Shredded and burned, ashes scattered. Jack wasn't taking chances. The smile grew into a full-on grin, Jack allowing himself to laugh. "Just like offices, I assume?" he teased. "Still haven't photocopied your arse yet either." Jack looked down, as if assessing his legs. "Oh, I don't know about that. I'd rather disagree with the shape of your thighs." Wanting to test that, Jack leaned forward, kissing him and making sure Ianto was indeed prepared to use that tongue.
He drew in a breath, lips drawn together as Ianto opened the box. There was only one thing it would signify and, yes, Jack knew how utterly schmoopy it was. But it was also something they'd discussed a while back and nothing had ever come of it. It was, in the end, one way that Ianto would always know, beyond words, that Jack would return for him.
The kiss, however, relieved all of Jack's fears. He wrapped his arms around his lover, returning the kiss for all he was worth. Losing himself in the taste of Ianto, Jack held him close until breath was an absolute necessity. "I don't think I've ever seen you at a complete loss for words."