Amazing. All the rigidity went out of his smile, and for the moment before he brought it under control again - because it was just a matter of course by now that whatever one was feeling, it couldn't be openly displayed - he came pretty close to actually beaming. When was the last time he'd heard that from someone he valued?
Just about never. Not that he was short of praise, in its most basic form. Stane had called him amazing and more, and meant it, too - but there could be no real appreciation from someone who knew they owned you. It was an admiration tempered by entitlement. What Tony did for him was superior, but it was no less than was required. That kind of approval could only do so much for him; it felt like a drink when he needed one. This was ... better. This made him feel like he'd done something he didn't know he could do. It wasn't a feeling he was familiar with. He'd never actually doubted, after all, that he could do anything.
And yet he was grateful for the out Jarvis was giving him from actually having to say any of it. That gentle sarcasm was much more his language (a softer dialect, but still) than any of the half-baked sincerities that he was trying to form. Something in his posture loosened, his smile dragged up to one side in its habitual cocky slant, and he was very nearly back to his usual self - just a little more sunny. He slung his arm across Jarvis' shoulders, and directed him toward the table; now that he had the adjustments in mind that he wanted to make, he could finish things off properly. "Yeah - relax about the piano. Ancient history. Think of all the space it's freed up. I'm thinking - I don't know. A lemon tree, or something. They can't be that hard to take care of."