Uh-oh. Well, that was a bit more serious than he'd been going for, which required him to sit back (not quite literally) and think about his answer for a moment.
"I think...that I was also there when it happened, it wasn't just you, and since you are doing most of the work actually growing our spawn, I should be helpful and do things for you," he said finally, shrugging. "I didn't mean fault in a bad way."
Mainly because he didn't think there was anything bad about the situation at all. For all that he was scared as fuck (this was a Very Grown-Up Thing he and Ruby were doing), Stephen was actually looking forward to meeting this kid.