It'd be foolish to think that he could love Jack without accepting and understanding who he was. As far as his tendencies went, at least. To try to change that was to change Jack. And wanting to change someone wasn't loving them. That's as easy as it was, Ianto felt.
"You get a lot of coffee as it is. Any more and you'll end up with the shakes." Ianto, incredibly pleased with Jack and the things he said. Incredibly. He nudged Jack a little after the partner comment and ducked his head a little. "Right. Partners. Completely. We're in this together, then."