"Have you ever thought about having kids?" Tony suddenly asked one morning.
"Sure, I've thought about it." Bruce said, his voice dripping sarcasm. Tony's face fell. "Wait, you're serious? Kids?"
"Yeah, why the hell not?" Tony said defensively. "We'd be awesome parents!"
"Tony, you know I'd love to have kids, but we can't risk it." Bruce said angrily. "I already hate that I constantly put you in danger, but you chose to be with me. We can't force that on a child. I couldn't live with myself if I hurt them, and you can't guarantee that they'd always be safe."