James' thoughts tripped up just a bit, unable to quite understand what she was getting at. That was just the way it worked. A kid needed a mother and a father.
"There's nothing to fix," James said simply. It wasn't like something was broken that needed repairing. They just had to react. Ideally, in some kind of productive matter. That was the thing about children: the minute children were in the picture, they had to come first. "Amarissa, nothing about this is going to be simple. It's not about simple, it's about what's best for a child- and what's best for a child is two parents."
As far as her mother went, it was something of a relief. James was completely content to let Amarissa handle her own relations, and tried very hard to force thoughts of Petunia from his mind. This time there would be lots of paperwork. Tons of paperwork. Legal forms left and right and magic - yes, this time there would be magic to prevent repeating the mistakes of the past. James had no qualms with muggles - loved them, thought they were brilliant - but if anything happened to him this time around his child would be raised by people who knew and loved him or her, people who lived with magic and weren't so close-minded.
"Explain what? And to whom?" he asked, a little indignantly. Reminding himself that Lily's ridiculous sister had nothing to do with what was going on now, he reigned himself in. "It's nobody else's business- okay, well, sure it's Harry's business, too, obviously- and you know, Sirius and Remus because they're family anyway, but they both like kids just fine."
There wasn't a doubt in his mind that Sirius and Remus would stand along with him, even if Remus was likely to be a little disapproving right off the bat. But he'd come around. Especially since technically it was his turn to be the godparent. However, James was certain the issue was less Sirius and Remus, and more centered around Harry. The step-mother role was pretty classically demonized, but it wouldn't be like that. Really, James' main concern was that Harry might feel... replaced, overlooked, forgotten; when really, more than anything James would want his son to be involved. After all, James'd had an appetite for a family since his parents had passed. He was certain that Harry would understand - eventually, if not right away.
"Look, I'm sure it'll take Harry a while to get used to it, but he's a good kid," ignoring the juxtaposition of their ages, "and it's not like you'd be trying to be his mother," he went on in a soothing tone. "We'd find a way to make it work."