Well, keeping a pet alive for a significant amount of time was always a telltale sign of how well someone would care for a child. Not that Tony couldn't do that, but he was practically a boy in a man's body most of the time anyway. Pepper probably got her fill of babysitting at times as it were.
"I heard that. Don't encourage her to hurt me. You women. Always got a thing about sinking claws into me." He shook his head and then stretched out on the couch Pepper sat on, his head pointed towards her as he settled back. How often did Tony put his head in Pepper's lap?
"It's not pointless information, Pepper. It's a very important thing to know. It's like having that little bit of inside info for soothing the savage beast or some such," waving his hand in the air just above him fluidly. "I doubt you'd have a problem knowing just how I like it in bed. You ramble, but underneath all of that, you'd pin me down and ride me to town," and he grinned, wagging a finger at her.
If Tony had any idea of what was going through her head just before, of the thoughts of a baby with him, of just being with him. Maybe it'd wisen him up, strengthen that spine of his into saying something, but alas, here they were in their usual mode of banter and comfort, Tony pushing his level a little more to see how far he could get before she'd tell him to go away in her own way.