Dont worry. Acording to the opening credits in the game it does seem that larger boobs come along later (I already have one but it doesnt look like she's an option.)
Another note of awesomeness is that whomever you marry will have a child with the stats of the parents. Which is why its called Generations. You have a child, your son has a child, his son has a child etc etc etc.
But yeah. Like I said. Thus far its a Tactical RPG (although it does seem confusing at first. Not helped by some confusing tutorials at the beginning of the game) but once you get into it its a very good game.
Just don't expect it to be boobs and hentai all the way through XD