Tony should have better anticipated Steve's very serious answer, and started to roll his eyes at the increasingly familiar refrain, only this time it came with more context. The teasing was abruptly gone for Tony to look sharply at Steve, then push himself up on his elbows, letting the cards fall, forgotten. "A register," he echoed, and the humid heat of the greenhouse wasn't enough to keep the ice from spreading through his chest. "Because something happened." That was the first point of tension, the one he knew to anticipate but didn't know how to stop. The second had always been Steve. He must have been too late to stop that one, too.