"I promise," Cal says, voice raised enough for Tony to hear, too. And also not entirely humorous.

He pauses for a beat for Tony to get out of earshot, then begins to tell Tina,

"Tony's parents -"

. . . weren't actually killed by drunk driving, come to think of it. Which Tony also knows.

Also that's kind of a mood-killer.

"- uh, I think he'd throw himself in front of the car if I tried," he says lightly instead. "Your mother has nothing to worry about."

(Cal doesn't even notice what he said: Not their parents, or Tony and Sherlock's parents, but Tony's parents. It's a little more truthful than he was trying for.)