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"Tony," Stephen greets him warmly from halfway down the stairs. "I'm not quite done with Stiles, yet, do you mind waiting for lunch?"
"No problem," Tony says easily, ascending the stairs to meet Stephen for a quick kiss hello. "Is this a lesson I can watch? This is the longest you've ever worked one on one with an apprentice."
"It's shielding, so yes," Stephen turns and leads Tony up the stairs and down the hall. "He's a talented little shit." Stephen shot Tony a smirk. "Reminds me of you, actually."
"The talent, or the little shit?" Tony asks, grinning cheekily.
"Both," Stephen says, and opens the door to the work room.
Tony steps inside and stops dead. "Mieczysław?"
There are two men in the room; both of them look up sharply, but Tony can't take his eyes off the younger one. "How do you know that name?" the young man asks sharply. "Just because you're an Avenger—or my teacher—" he casts Stephen a sharp look "—doesn't give you the right to dig into me."
Tony raises his hands. "No digging required, and stop glaring at Stephen, he only ever called you Stiles. I know your name because you're my half brother."
"Are you shitting me?" Stiles blurts. "I knew I was adopted, but Tony Stark is my brother? That shit doesn't happen in real life."
The older man snorts. "Since when do our lives conform to 'real' rules?"
"This time, it's actually a pretty old story," Tony says wryly. "Howard had an affair. Lawyers swept everything, including the resulting child," Tony waves to Stiles, "under the metaphorical rug. I found you when I did go digging into Howard, but your adoptive parents seemed like good people and you were doing well, so I stayed out of it."
"Dad is pretty great," Stiles says. "Mom was, too. But you know…" he shoots a tentative look at his companion, then turns back to Tony, "more family isn't a bad thing, right?"
Family had always been… complicated… for Tony, but he wasn't about to squash the hope in Stiles's eyes. "Not a bad thing at all."