Janto AU
Ianto's soul had stood out to Jack from the moment he saw it. It wasn't just that it was hard to read, although that certainly added to the man's allure. It was... well he didn't know what it was exactly. But it was the brightest most beautiful soul he had ever seen despite all its damage. And then there was something more to it, Ianto wasn't all that he seemed. He felt drawn to it like a moth to a flame.
Also getting to know the man certainly didn't help. Even the way he had introduced himself stood out. Jones, Ianto Jones. That incredibly sexy Welsh accent. He couldn't get it out of his head. Plus he didn't look bad in a suit.
Jones, Ianto Jones there's more to you than I could ever imagine isn't there? Jack thought. His question remained unanswered and he eventually drifted into an uneasy sleep.
I'm afraid that I don't have a good explanation for this. Jack isn't human in this although he takes on human form, also he can read souls. Ianto is human though.