I severely doubt that as Laura Bailey has voiced a crap load of people including Serah Ferron from Final Fantasy XIII and XIII-2 to list one example of what I would refer as her anime voice.
It's just I think that I would puke if they asked me to say those lines, "back from some big adventure I bet" - finger down back of throat. Mind you I would sell out if it meant large sums of money coming my way.
Try asking Serana about marriage, and then tell her that you were only curious. She'll admit that she knows what you're getting at, but after all the things she's done, she couldn't bring herself to ask the gods for a blessing like that.
That's why she won't marry you.
So keep it in your pants and respect the woman's feelings.
OP, you seem to think the modding community owes some sort of obligation to you.
No it seems a legit question to me, with all the fuss that has gone on about her and compared with some of the mods out there it really seems a harmless modest request in comparison. I have even come across a mod tweak to move NPC's B. holes, if the OP had asked for that I would have raised an eyebrow.
Modest pun, get it.