The thing was, it was going to be uncomfortable anyway, wasn't it? Either about Peter, or them or the portals. So they might as well pick one and just run with it and strangely enough, Peter was probably the safest bet.
"I know," Tony said, softening somewhat, because only a complete asshole set out to purposefully make Steve Rogers feel badly. And while Tony could be an asshole, he wasn't completely one. "He''d probably like one anyway," he said finally. "Unless you're saying you want a kid. In which case, I'm going to have to remind you that kidnap is generally frowned upon in places like these."